These are ideas that the community at large came up with here at Stone Soup in Eugene, OR and some others that I added.  I might just make this an evolving list.  Please comment and I will update this post as an evolving article!

1. Offer a showcase and/ or performances for students
2. Offer social Tango parties (different than milongas)
3. Offer a retreat where people stay together in one place and do more than just Tango
4. Require for a class than students go to 3 other events
5. A teacher takes their students on a field trip to another Tango event together
6. Offer taxi dancers that wear something that designates them as such
7. Form a welcoming committee where at milongas/ practicas designated people welcome any “strangers” to the event
8. Publicly recognize newcomers and thank them for coming
9. Publicly offer a master class
10. Ask current community members to talk up tango and bring new people to an event
11. Have advanced dancers join a beginner class
12. After class/ milonga/ practica all go out to a restaurant/ bar and hang out together
13. Have a potluck
14. Watch Tango movies and talk
15. Form an online community through news groups or Facebook or ?
16. Switch around DJ’s so their friends come
17. Have a Q & A session on a juicy Tango topic
18. Have a special milonga just for beginners
19. Do Guerilla tango
20. Affirm people’s dancing – tell them what is good about their dancing
21. Have a monthly recruiting milonga
22. Eating between classes and the milonga/ practica