In short...no!
Performers are expected to bring their own accompaniment (be that in the form of an instrument, or a backing track on their own audio player).
Nor do we have any house guitars for performers to borrow (you'd have to ask your fellow performers if you can borrow theirs, which is never guaranteed!).
Depending on which performers are there on any given night, there may be some performers who would be happy to accompany you for your performance.
It's best to speak to them as early as possible (to give them time to learn your song!). Even better, we have a Chat Group that you can use to ask for help before you even get there!