Member referral month with a shared reward for both people

Pick one month and announce to current members by email and on a studio flyer that anyone who brings a friend who joins gets a free month, and the friend gets their joining fee waived. Track referrals with a simple code entered at sign-up so you know who to reward.

Why it works: A reward for both the current member and the new one gives both people a reason to follow through instead of just one.