Conventions section is being reworked again - it should be done by the end of this weekend, but you will probably have to add them to your profile again. Sorry about that, but we've been trying to figure out the best way to prevent duplicate conventions from being added to the list. (Since people don't seem to check the list before trying to add a new convention, and then we get 5 Anime Expo's and 3 Akons, etc)
This should be the final time we rework the conventions section, and we're also adding in some extra features that I think are pretty neat. More details soon!