[smt88]

Get local newspapers, radio stations, and evening news to cover it. Post on craigslist. Do things that don't scale (talk to people at bars or on the street, post flyers around town, etc.)

My experience with MeetUp was that all social meetups were single men looking for women. It made for some very creepy gatherings, and my friends and I gave up on MeetUp permanently as a result.

If you can solve that problem (have good gender balance and prevent creepy people from showing up), you'll be a lot more likely to succeed.

[cha_os]

Thanks a lot! The gender topic is especially interesting, because at the moment we have about 1000 users - 70% women.