I'm all for a late afternoon bbq or whatever sort of gettogether, that would be great.
I'd say everyone plan their initial ascent time to get to the tram at 8am (whenever the first tram goes down). Then everyone could start the 2nd one together, go at different paces, and end up with several hrs difference.
After 2 skylines, I won't mind passing out in the park with a Hoegaarden for a few hrs before the festivities
