Massingham dedicated one of his books to 'The Avebury Party', so megameet parties are not new.
I think we should have a bust of Massingham made, then dusted and decorated with a crown of laurels at each Megameet :-)
Also seem to remember that William Morris and his mate(s) used to escape from Marlborough College to the 'lions' every now and then - the lions being the Red Lion?