Don't be afraid to be the first to sign up to get the ball rolling. Or rather, bouncing! There are many wanting to play tennis here and coming to this page and thinking "too bad nobody signed up". lol So sign up, have fun!
These are free courts, so it's first come first serve.
Until someone takes over this event and changes these details, at least one person will have to say how to find them there. It's not a requirement, especially if the profile pictures are clear and easy enough to figure out.
I highly encourage you to use this site as a means to organize your tennis events. Its much easier to determine who is going to be there and not having to wait on emails to cross back and forth between several people discussing the weather. :) Just sign up and show up. Or sign up and cancel later without need of constantly explaining! So much easier this way. Awesome, isn't it?
If you want to host this event at a different time or place just delete all these details and make it your own. ANYONE can edit this, even if you arent an organizer!
One last thought... If you are signed up and want to make sure that one or more of the other attendees will be there then just ask them to confirm. Sign up now and if you later find you can't make it just change RSVP to 'no' if you need to cancel.