The Cask Festival is a fun event for those who like Cask beer, but it will be hard to find people. For those who don't know a cask beer is only naturally carbonated and is served at a higher temperature. This event is hosted by the Washington Brewer's Guild as a fundraiser and is generally a good time, but I would recommend buying tickets in advance. There are two sessions for Cask Festival- one from 12:00 to 4:00 and the other from 6:00 to 10:00. Separate tickets are required for each session. For the record I am not in charge of organizing this event, but will be attending.
Please find tickets and additional information at this link: http://www.washingtonbrewersguild.org/.