This is a great forum thread listing where the OUAT cast will be appearing throughout Summer 2014.

Note: Check the specific convention website for up to the minute information. Some cast members may also be attending to sign autographs and not panel appearances, so check the specific convention website for complete information. OUAT Cast may make appearances near conventions like Comic Con, but not at Comic Con. It is recommended to follow all OUAT Cast on Twitter or Facebook for Off (or Nearby)-Convention appearance news.

http://www.fanforum.com/f373/%E2%9D%81-ouat-conventions-%E2%9D%81-63103832/

Will you be going to see them?