All of our meetings to date (well, okay, both) have been held at venues within 60 - 75 mins drive of a majority of attendees since, realistically, that's about the max for evening meets (particularly on school nights).
We're considering readily accessible pubs in the Cambridge/Newmarket triangle this time, so should still fall within the above range for you too. I'm over that way during the weekend and have one or two other places that I'm gonna recce. So watch this space.
Now, Chris, for the big question. Are you definitely coming along or only if we can provide a cast iron guarantee that it won't rain?
Oh, and it's my birthday that day so you make sure you bring your wallet!