One thing that caught my eye was the talking to the audience. ....When I was able to go to concerts it would have really enhanced the experience for the artist to say a few words. Back then the concert goer was expected to know all about the pieces.
I am still surprised when I do concerts and meet people after the event who tell me that they have never heard about the things I talked about and it made their listening experience all the lot more enjoyable. However it is becoming more and more the norm with solo concerts these days to speak to the audience, you will also tend to find with orchestras these days the conductor or someone else will say a few words before the music begins. I listen to classical radio station almost every day and often catch concerts around the world where someone is talking a little bit about the composer and piece. It just makes the presentation "complete", a full package of entertainment and learning.
I hope that most soloists don't want to be thought of as merely a "Curator of fine art", you know someone who just comes out and displays all these wonderful art work but says nothing at all about the works or composer, you just have to stand and look at it and be impressed. I go to art galleries and look totally perplexed at what some people consider art, then I catch a glimpse of someone who are really studying this abstract art at all angles and distances with such great wonder, I wonder what I am missing out on! I am certain that many people view piano music the same way, so as performers we should feel it our duty to try and ensure ALL the audience are "on board" with what the music is on about, we should remove some mysteries for them. From my experience the general concert goer appreciates it a great deal.
I haven't been to a piano recital/concert in 40 years because I live in a small market town for classical music and smaller market for piano.
You have hit on a point which is extremely exciting and full of opportunity for performers. I have done concerts in Australia where the population of the entire town is less than 200. But do you know that about 90% of the entire town turned up to the concert event? From my experience these towns are literally dying for something to happen in town, it doesn't really matter what it is if something happens the entire town is there. My uncle owned a hotel in Williams, West Australia which also acted as the local bar and restaurant, the only one in town, everyone came there for food, it was as busy as a popular place in a main city. This totally surprised me the first time I witnessed it. I was in the middle of nowhere but all the people come here! The power of monopoly is very obvious in small towns.
For aspiring concert musicians they should be encouraged to perform in small distant towns. You will find advertising in these areas is very easy and simplified, you will gain great knowledge about how creating a concert works. You should get to know the community you want to play in, go to social clubs, schools and play for free etc. The cost of hiring a hall is often next to nothing and you will fill the hall easily if you spent time advertising your event in town. Basically you need to send out your intention of doing a concert in a small town, send that info to who needs to hear about it in that town, then ensure that it is put on the newsletter or paper that goes around that town, this should be done at least a month before you arrive so people have some warning of your arrival. Then when you arrive you should spend at least a couple of days there to get to know the community. When you return the 2nd time you do not have to invest such time but you may find it difficult if some of them ask you to visit the next time you return. This investment may cost you a little bit of money but if you intend to hit the same place again it will be well worth it. Even if you do not intent to return at least you will learn a great deal about how to deal with people and how to organize a concert event, tools which will serve you well in more expensive larger city concert projects.
I really find doing concerts in small towns hundreds of times easier than doing it in larger cities. Your chances of success are much greater. Something non concert related but certainly very amusing for me was when I visited a place called Kalbarri in West Australia for my cousins wedding, it is not really a tiny town but about 7 hours drive from Perth city at least. I visited a popular seafood restaurant there and noticed an upright piano in the corner. I started to play it and the manager who was cooking the meals shouted over to me to keep playing and play louder. He then gave my meal for free and offered me to come back and play the next night for more free food

Although I had to leave the following day I told him I would be happy to play for my food!
There is just so much more attention to things in smaller towns. In larger towns people are so busy and life is so quick paced. I've played in a few dining places in more populated towns but often these places have their pianists and no one really cares. But in smaller towns everyone pays attention, it is totally a different thing to happen, they yearn for this. Thus going to do a concert in these small towns is a goldmine for concerting performers who want an easier task to set up a successful performance.
lostinidlewonder, please accept my respect, you have brought into light what is required as a pianist plus the commercial issues for becoming a well-known concert pianist. 
Thank you for such a kind comment. A lot of what I learned during my first few public solo concerts would have not been possible if it where not for the tremendous help that family and friends provided me. My father is a professional engineer who heads multi-billion dollar projects, he has always tried to impress upon me the art of business, motivational thinking, goal setting, dealing with people in business etc since I was young. Even though I sometimes found it annoying when I was younger now as an adult I can really appreciate some of the habits he was trying to teach me, it really is what excelled him in his own work. So I have been very blessed to have such experience to draw from.
What terrified me most of what you wrote, was the deadline issue, when one has a short limited time to get ready for the showtime.
For the full time performing artist you have to have the craft of playing/learning pretty much top notch, it shouldn't even be an issue for you and you should feel confident that you can perform the program without failure. Can you imagine how difficult it would be to try and organize your concert event with the dreaded thought that several passages of pieces you need to play are not controlled adequately? You will simply have a mental breakdown if you try to juggle it all. The playing side to things needs to be the easy part, if it isn't you will set yourself up for great strife.
What you reminded me and I am deeply and very grateful with you is that it's not necessary to learn the most complicated piano pieces to show both the others and yourself your improvement and skills.
I can personally relate to this with my first two concerts I ever did. The first one was not overly complicated and full of popular,semi popular pieces and a few lesser known, at a good standard but by no means a display of a high level of virtuosity. My second concert I included more complicated works which really took me a lot of time to prepare. Some peoples response was that they enjoyed the first one better because the "complicated stuff" they couldn't really emotionally connect to as easily, but some people said they never knew the piano could sound like it did and it was very interesting, it was a mixed response. It provoked me to realize that in Australia at least, people generally want to hear things which are not too abstract.
I don't really think for instance in Australia they would respond well to the complete set of Debussy Etudes or even the more lovely Preludes for that matter (and these are nowhere near as abstract as piano music gets!). They love selections of it but not the more eccentric ones I have found. You can put it in but don't make it a main focus. I could imagine if I played a concert of intensely complicated abstract music which would take me a whole lot of time to learn, the majority of the audience would simply shrug their shoulders at it and think I was hitting random notes.
It is sad I know, but it is the reality, most people don't care for complicated music. Even if you think you need to pull of the most difficult Liszt piece which may sound wonderful it is really missing the point that most people will not realize how difficult it is. I find it amusing that most of the times an audience is impressed by things which are not really difficult at all, such as rapid octaves playing, but it is no where near as hard as other technique you come across which they will simply miss.
Difficulty of a piece should not really be an issue when constructing your program (given that you are a concerting pianist who plays at top levels). You need to consider what musical journey you want to take your audience through. The pieces fit into this musical journey, they sometimes choose each other, sometimes an idea in your presentation controls what pieces are chosen, you don't just look at the difficulty of a piece and choose what to play from this you create a program where people will not care about all the hard work you have done.