Tennis Camps are offered once-a-week.  Camp classes run two hours, from 6 to 8 PM, on a given day each week.  E-mail goes out to everyone each week, giving which day camp will be on and deadline for signing up.  For example, if camp will be held on Tuesday, e-mail may be sent on Thursday asking whoever would like to participate in the upcoming camp to RSVP no later than Sunday night.  Player does not have to commit to multiple weeks or way in advance (or even have to reply if he/she doesn't want to participate that week), but it allows director to know who is coming, plan for the correct number of instructors and place players in groups that are of similar skil-levels.