[Aviv100]

If you're not wearing a costume, don't worry, there are a lot of people that don't.

What to expect is a little different everywhere.

Anime Expo is the biggest in North America (been going there for the past 3 years) and they have concerts, an American Idol ripoff performance, AMV contest, anime episodes showing in different rooms, dealer's hall (exhibit hall - where you buy stuff), Artist gallery, etc...

So it really depends. Any con you go to should have a website with info about what they're doing. If it's a rather popular one (like Anime Expo) be prepared for lines and depending on where it is, make sure you dress for the weather (my boyfriend got a nasty sunburn standing in line).

I would also suggest going with a friend or two, makes the experience more fun.

Which con are you going to?