After Church picnic question.

Ok so our church is having a picnic coming up soon after regular Sunday service at a member's house. Real casual. So the hubby and I have been playing music at church off and on and naturally during the Sunday services we are playing only Hymns and Gospel stuff. So what's everyone's opinions on what music can be played at the picnic? Still only gospel, maybe some bluegrass and folk, what do you think is appropriate for this type of gathering? Thoughts please.