Logistically it is very difficult to have a massive group. There are problems with ATC's, accomodation, fueling etc all over the country etc.
I have seen this with bike trips, too many bikes at the same time and even garages with multiple pumps can't handle the problems.
I could be an option to have a centralised Jol somewhere over a few days to allow for delays caused by weather etc.
Alternatively, why not have the "Microlighters Iron Butt awards" An award given to those members who complete said epic journey, with appropriate proof, such as till slips, petrol slips, GPS tracks etc. Then everyone can do their own trip in their own groups and all the airfields around the country offer free accomodation and at the end of the year the winner, i.e. shortest time, longest distance, lowest fuel consumption, most beers comsumed (Sorry I've won that one already

) will get honoured here on this forum and I'm sure I can convice darling Afskies

to do an article or two.