I would say just play it safe, too. There's some really nice fall/thanksgiving decorations.
Now, I'm going to preach, AGAIN (I know, I know), so if you're not in the mood, simply don't read the next paragraph, for you have been fairly warned!

To jpianoflorida, I just remembered that section in the new testament, where Paul says some feel that one day is more special than others, and some only eat certain meats, while others eat anything, and that he (Paul), respects whatever the people he is with, are doing. (As long as it isn't contrary to Scripture, of course). So I agree with Bob, that playing it safe would be the right thing to do. You won't offend anyone by not doing it, but like you said, some might be if you do do it. Regardless of whether they are right or wrong, respecting the fact that some might be offended, and not doing so, imo, would be a good idea.
I will mention on the side, though, to anyone in general, that in regards to switching denominations, and one denomination celebrating halloween and the other not, if you want to get really Christian, "denominations" aren't even in the Bible. People just made those up! So please don't anyone base whether something is right or wrong depending on what a certain church says. If you're a Christian, just go straight to the Bible, or else you're just getting that denominations "spin" on things. And if the Bible doesn't address whatever issue directly, you can be sure it will address it in principle. So that goes to follow, that just because alot of people from a certain church are embracing or condemning something, that doesn't mean they are right or wrong either. Also, everyone is at a different stage in their "walk." It's not, boom, I'm a Christian, so I'm totally perfect!

I'm not denying that their is definate change, but like all things in life, it's also a process, so never rely on what other people do, but instead on what God's Word tells you to do. Sometimes, well, alot of the time, even pastors/priests/ect. aren't where they should be in their walk with God, so best to just go to the source! I'm not picking a fight with anyone, but just thought I'd mention that because denominations are a pet peeve of mine, especially the "non-denominational denomination."