That’s a good question. I usually get information about events from friends but I don’t know where they get it from. Usually towards the end of the week blogs like DCist will post what’s going on during the weekend but it’s not very comprehensive. Or I’ll just Google ‘What’s going on in DC this weekend’ and a few sites keep calendars of events, but the sites are usually pretty crappy. It would be nice there was (or is!) a site with an interactive user interface where you can search by activity, price, location, date, etc.