Hi - just upgraded to pro module to get access to scheduling. It's perfect for immutable dates. I'd like to request a feature to get band members to pick from multiple dates to schedule an actual gig. e.g. Can you make Friday May 4, 11, or 18?
I'll put this on my wish list. Meanwhile, you could request availability for all three dates, and delete all but one after you make the decision. Alternatively, you could try one date and if people decline it, try the next one.