I think their crowd capacity is approx' 4000 so plenty of room. Car parking at ground not very good so it looks like street parking although there are a couple of public car parks within walking distance. On a positive note there are also food outlets reasonably close, ie Pizza Hut, KFC, a Morrisons store.
Should be able to easily do the journey in 3hrs or less from Boston but there are long 50mph limits on M62, in fact I don't know why they don't just make the entire motor way a 50 limit.
Should be a good Boston turnout.
For those of you taking your wives or girlfriends there is an IKEA next to M62 at Leeds so I suggest blindfolding them or stick your fingers in their eyes just before Leeds, oh and if you happen to see a jogger/runner wearing a Boston shirt it will probably be Ken.