The single best form of attracting new customers is referrals. It always has been, and it always will be. Period.

People trust referrals from friends and families more than any other form of advertising:
- 77% of consumers are more likely to buy a new product when learning about it from friends or family. (Nielson)
- 81% of U.S. online consumers purchase decisions are influenced by their friends social media posts (Market Force)
- 49% of U.S. consumers say friends and family are their top sources of brand awareness, up from 43% in 2009. (Jack Morton)

Start with making sure you nail down product/market fit. Are a lot of people coming to your events? Are they having a good time? It sounds like yes, but if you want to be 2x sure try using something like SurveyMonkey to determine your Net Promoter Score. Follow up with each 'promoter' (an 8 or higher) and ask them to bring a friend to the next event.

If you'd like to chat more about how my company has worked with the American Marketing Association to use referrals to grow their events I'd love to schedule a call and discuss the details.

Also, consider offering a discount on multiple tickets (1 @$10, 2 @ $15, 3 @ $20) to try and get people to bring their friends. In fundraisers this is common by selling an entire table.

Hope it helps!