From Croquet World Online:
Matt got even more serious about marketing the club and the event offerings. One of his “good ideas” turned out to be surprisingly great--having a Groupon and then later a LivingSocial.com coupon offered to the public on those two different but popular coupon sites. Matt’s coupons offer a group of four people a choice of several three-hour blocks of play for $30. Specific times are set aside on the club's increasing complex calendar for the groups to choose from.
The coupons were an instant hit. With minimal "management" that includes just a few minutes of instruction for all the coupon groups together there in an evening, these events are fun and profitable and easy to supervise.