We play the front nine one week and the back nine the next week. There are no set tee times, we just show up at 4:00 or later, tell the Pro shop we are with the HASGA singles group and he puts us out on the 9 holes for that week.
To play respond that you will be attending on Meetup.com. Indicate the time that you will be there, any time between 4:00 and 5:00. When you get to the course look for the others who have signed up on the practice green next to the club house.
(If you can get there a little before 4:00 or after 5:00 post note that when you sign up on Meetup. Usually not a problem playing either of these and someone else may want to play with you at that time.)