Scanning the thread, I have managed to identify when it's happening, and some of the planned bits. But, other than the fact that the locality is Stony Stratford (andhere is a map of that), and that this is in Harlow's rather hypertrophied offspring Milton Keynes, there's not been much information about where to meet up, and indoor camping arrangements and so forth. At least I haven't been able to find it.

Some kind person spell it all out in a post, please.