I will try to answer these to the best of my ability from my time there at Bethel.
1. They are in different congregations. Some go to The Heights cong. Some go to other halls. The older frail ones would all go to 107 since it was easiest.
2. The congregations they go to all have 'regular' pubs including the Heights cong.
3. Yes
4. Yes
5. No, but during the summer they all get sent out to conventions all the time so I guess they miss meetings then.
6. Yes
7. Yes. No idea if they donate. At Bethel we were encouraged to donate, which makes no sense whatsoever.
8. They do serve as elders. I don't know if any handle much in the congregation. I do know some of them would conduct the WT study. My guess is they'd be too 'busy' to do stuff like PO or Service Overseer.