Made some small improvements to the Conventions Page, namely:
1. We now have a "Most Popular Conventions" and "Conventions for the Month" on the main listing
2. Individual Convention pages will now let you fix the date if you're logged in - if you see a convention that has the wrong date, or no date at all, please change it to the correct date, as this will make it more useful for everybody else.
Some of you have also requested linking more than one convention to a costume. That will probably be active by this weekend, so you can start a "Convention History" for each costume I guess...