Hi Melissa!
The most common techniques that people report are events that your potential members would be interested in. These can be educational events, social events, some combination of the two. The more engaging & participatory the events are, the better!
Make your goal helping people connect and bond with each other rather than simply "get them in the space", even if it happens to be in the context of the space.
You can host other peoples' events, but be prepared for low direct conversions to membership. Hosting events can be good for spreading awareness, but very few people join after seeing the space just during an event.
It's a bit counterintuitive, but my favorite technique for early community building is actually getting OUT of the space and going to get to know people wherever they are. Contributing to the community outside of the space has, without a doubt, been the #1 most effective funnel for new membership over our entire 6 year history. Just this past friday I was at a massive gala event (600+ members of the Philadelphia tech community) and heard from countless people that they can't stop hearing about us - our community is "notorious" for being supportive and helpful.
That's marketing you can't pay for. :)
Good luck!
-Alex