Create "Member Only" Premiums with Early Bird Extension

About a year ago, IMBA's membership team noticed many of our members were renewing after their expiry date, and often after the "Lapsed" or grace period of two months we have in place. To help accelerate these renewals, our membership team decided to offer a "members only special"—a t-shirt normally reserved for $100 and up memberships for a lower membership fee of $50—if the member renewed as an "Early Bird" i.e. before their expiry date.