Adult OA Member Nomination

We will be having our OA elections next week. I have just received a form to nominate an adult for membership. While about three adults in the Troop qualifiy for membership (you have to have done an entire week of summer camp during the last two years), we have questions about the position:
1) What will the nominee need to do? Are there one or more weekend activities that he will need to attend assuming he is approved for membership?
2) We have a former OA member who is now an Assistant Scoutmaster. Would it be appropriate to nominate him, or does he just rejoin if he wants to?
3) In general, what is expected from the adult who is in OA? Are there specific responsibilities?
1) What will the nominee need to do? Are there one or more weekend activities that he will need to attend assuming he is approved for membership?
2) We have a former OA member who is now an Assistant Scoutmaster. Would it be appropriate to nominate him, or does he just rejoin if he wants to?
3) In general, what is expected from the adult who is in OA? Are there specific responsibilities?