I’m definitely up for it!
I guess one session should focus on each box.
Personally for OT I’d like:
sampling (including internal sampling)
Performing long samples (basically turning it into a DJ machine)
The use of scenes/parts (especially for performance)
Then others like:
single cycle waveform use
MIDI sequencing
sample chain use
I think that’s the most requested OT questions.
For A4:
Maybe a bit about the architecture, syncing the OSCs, modulation, FX sequencing, Sound locks, maybe CV sequencing too.
As for AR, don’t know because I don’t have one! (yet) 
Format wise, think it would be good to have a lecture/seminar formats (with breaks!) then maybe some drinks before performances by whoever wants to do it! Should take up the afternoon nicely