South Beach on Ft Lauderdale is home to Cat44. There is a good sized Hobie 16 fleet that usually meets on Saturdays and Sundays. Very good people, I have sailed out of there once already and cant wait to go back.
If you want to launch off Ft Lauderdale, make sure you show up early. You have to drop off the trailor with boat and turnaround and drop off your car in the parking lot. In Ft Lauderdale the water is not protected like in Biscayne Bay. If you are comfortable with that, Ft Lauderdale is a good option. As far as sailing out of Ft Lauderdale during the weekdays I have the slightest clue. I dont think there will be a problem, but you never know. It is in fact South FL.