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There should be a signup sheet at midway to collect email addresses to email about the upcoming class. Ask for name plus email, so that if their handwriting is bad you have a second change to figure out their email, and maybe the class year to help you confirm you got it right. You can seed the paper with a few fake entries to make it look less empty. At the end of the event, make sure the list goes to someone to get the addresses added to the tech-squares-interest mailing list. When trying to decipher the addresses, in addition to regular finger, you can finger with wildcards against mitdir.mit.edu, or use this page, which is very handy when you can read part of the address.
Other things that might help
- Use modern music (this means refreshing the tips every couple of years)
- If you have multiple squares, try to balance their skill — don't load all the rusty folks and class members into one square, and the regular attendees to another, because it's likely to make the weak square to collapse
- Think about how to balance the virtues of "multiple squares", "strong dancers", and "looks like MIT students"
- Email out (a link to) the tip that will be used to all students or all club members or something, so that people who feel shaky can listen to it first and figure it out