Jazzy, I'd take the advice offered above and let your fingers relax for two weeks, if you have a day or so to get back to speed before the festival.
 
Pauldo, I feel for you brother. I just found a part-time job myself and am back among the employed after a 3 year hiatus. I think the job market may have improved a bit. Best of luck and don't get too bummed.
Mike

When I was but a wee lad and my parents would take us on 1-4 week camping trips I'd bring my electric guitbox with me and just play unamplified.
 
I realize this is a little more taxing on an Alembic. I'd get a cheap acoustic guitar and bass. Something that you wouldn't care if you threw it on the fire one night. It won't be amazing to play but it'll get you though.