big congrats, hus! we're all excited for you!
some suggestion: provided this is gonna be your first performance, pick pieces that you are comfortable playing. those listed in your program are fine. dont worry about trying to to learn a new piece. use your precious time to polish your chosen pieces.
if you are still juggling with the idea of putting the mozart C major sonata ( i assume the 1st mov only ) or not, then think quickly but wisely whether you can really bring it up to a concert standard in two months. or ask your teacher, which is prolly a better idea. one thing we all know: you have tendonits and so you dont wanna overburden yourself with lots of practice hours.
try to balance your practicing with resting time. mental practice can be of tremendous help. if you wanna try mental practice, try it now coz you have two months to get used to the idea of learning pieces away from the piano. yes, sure you'll see alot of benefits from doing so, BUT dont wait till later ( if you wanna wait, wait till you finish your concert ).
important: make sure you play your program several times to different people before your concert ( even just one person at a time, thats more than cool ). play for your dogs isnt too bad an idea either

lastly, one must have a disciplined mind to pull off a quality performance. i strive for perfection when practicing. its different now when i am up there, in which i focus more on the joy of making music itself and on communicating with my audience, heart to heart, soul to soul. heh....
now for you, discipline, discipline, discipline.......
btw, keep us posted and best, tds