Are you thinking about starting a tech company in the DC area? Do you want to meet with other entrepreneurs, see what they are doing and meet interesting people? You should because it is one of the fastest way to learn what you need to know in order to be successful as well as make useful connections that might be helpful later for your company.
There are a ton of different meetups and events available to you and there is no way I can list them all here. Instead I have made a very short list of the ones I fairly regularly attend, with a brief description of their focus.