People who are in charge of the meet (or mod/admin team) share out their contact details... Therefore people have several points of contact if running late and such...
Hard to do meet ups at 9, defo from park opening is best for about 30 minutes... If not, let someone know you'll be late and sort out a meeting place...
Faff is inevitable, with toilet breaks, sorting out who is riding and stuff... Just need to make it clear that the group WILL move on without you if you choose to move off whilst people are queuing and the like... It needs to be made as a group effort, which means people going should also adhere to meet up guidelines, rather than just the organiser(s)...
Easy things to do really... Just need someone to take charge and ensure that people follow a set of guidelines... I remember taking charge at the mini-Legoland meet t'other year, and then people ended up going off forgetting about others... That does not make a good meet, let alone on the Swarm ERT where no-one knew who half the people were... Need to make the meets much more special and all day, spreading it to other parks (Paultons for example wouldn't be a bad shout, easy enough to get to between people on trains and car drivers) would also be beneficial, cos Thorpe every two months is boring as hell...