There will be log sheets to sign! There will be food! There will be travel bug and geocoin swapping! There will be a raffle! There will be a group photo! There may be other exciting events! All within the space of 15 minutes!
Before 6pm, please look inconspicuous. Do not hang around together or look as if anything's about to happen. At exactly 6pm (according to my GPSr) I will reach the lamp post with some buckets. You can then all come over and join in the party! But only for 15 minutes! After that time we will disperse as if nothing had ever happened.
After the event, anyone who wants can go to the Free Press pub (but that won't count towards attending this cache: you have to be there within the 15 minute interval to count it!).