You should have found "one" who was interested (hot to work on your project) while you were there, and "closed the deal" right there.

Separate the wheat from the chaff, and ABC (always be closing)!

If you thought to get their e-mail (in my opinion, the best way to "initially" communicate with most coders) pop them an e-mail and see if they are still interested. Not everyone is a phone person.

What did they have to gain from contacting you? There needed to be a compelling reason from their perspective to get back with you.