UWC Fooides in Wahington DC invites you to join them for a potluck style brunch in Kalorama starting at 12:30pm followed by the free live broadcast at the Nationals Park of the Aida (performed at the Kennedy Center) which starts at 7pm. Before the show there will be pre-opera entertainment and activities. If that weren't enough to convince you, the event is sponsored by Mars so there will be free Mars bars, M&M's, and many more delicious things! 
Let the organisers know whether and in which activities you want to participate in by signing up on this spreadsheet.
The exact address will be shared later on with the attendees.

The brunch starts at 12:30pm and the opera starts at 7pm.