Although I'm not going to this , can I suggest going earlier than 9am? Especially going as a group, you have to have some allowances in time (for people getting lost, getting caught up at lights etc us oldies know too well.. ). Those that went to the last meet down to GOR can verify, going to the GOR is a long day by itself. Adding stops for photos, stop for lunch; you don't want to be driving back when it gets dark.
My opinion. :)