Dude, just show up one evening. Talk to the late arrivers who don't get out that day, and wait around for those out fishing to return (can be as late as 10:30 or so till everyone gets in). There will be food, drink, and much merriment between a bunch of people who are only semi-familiar with one another. Friday and Saturday evenings will have the most ppl. Just jump in a conversation and get to know people.
Nobody who is physically present at these things has any trouble finding someone to fish with. But if you don't physically show, keep in mind that nobody will be "lonely" either. Plus, they'll be camping with limited or no access to the board. Asking them to call you is probably not the best approach.