If I was organising an event like this I would put the meet up time at 12noon and then the finish time at 9pm. That would enable people from outside London to get buses and trains home easily. The meet up time for most major demonstrations in London is usually 12noon with a start off time of usually 1pm.
If I was organising an event like this I would put the meet up time at 12noon and then the finish time at 9pm. That would enable people from outside London to get buses and trains home easily. The meet up time for most major demonstrations in London is usually 12noon with a start off time of usually 1pm.