It's not that long to our first birthday (July 26th), and it would be nice to mark it in some way.
I'm sure that there will be plenty of silly ideas - save them for chat. Let's have serious ideas here.
I think we should make an effort to bring down the number of unanswered questions before our birthday. There's plenty of questions where answers haven't been upvoted and the OP hasn't returned since asking to accept the answer. But I'm sure lurking in that list are some questions that we can find answers to!
Also, if there are questions with answers on the list, and the answers are good, please do upvote them: that way, they're off the "unanswered" list...
One that springs to mind is to get the first version of the TeX-SX-package up on CTAN.
Martin suggests we schedule a 'party' in Chat: http://chat.stackexchange.com/transcript/message/1340323#1340323. Seems like an interesting idea :-)
We also could have a special community ad on that day. Maybe showing a cake with one candle and saying "Happy Birthday TeX.SX" or something. It could link to some birthday announcement of meta or the birthday chat room when it is running.