If you advertise starting time and place, and estimated pace, there are always people here looking for other people to ride with, and Beach Rd is pretty popular! If you don't get any takers the first time, they will come sooner or later. No doubt some of the existing regular rides here have started that way!
Don't know what pace you are looking for.... but some of the people from my thread for Sunday Beach Rd Rides are available on Saturdays (some of the time at least), and that might include some of the people who have tried the rides in the thread and found the pace too slow (i.e. those whose average speed leading a group is from 28 to low or mid 30s).