Need advice from some of you Brits

Hey, I’ve got a few days free at the tag end of my trip to Ireland and the UK. Would it be a good idea to pop in to visit the Cheltenham Science Festival? Is it easy to get to, and once I get there, will it be easy and reasonable to get lodging for a night? I’d love to see Robin Ince’s Infinite Monkey Cage in particular, but I’d be unhappy to make the trip and then discover I need to book a month in advance and that my only choice is to sleep on a parkbench.