One thing I try to do is send a handwritten thank you postcard for every gig I do.  Well, almost every gig. If it’s a horrible experience and I don’t think it’ll change and don’t want to do it again, they don’t get one. 

There’s not much to these, just a simple thank you.  That’s all.  I used to send a more elaborate thing with a survey, but no longer do that. Just the postcard. 
This is just another way to keep your name in front of the booker after the gig.  
-Louie
