How to Create Multi-Event Coupons
Event Directors can also create coupons that can be applied to multiple events, by using the "Coupons / Credits" feature, under "Event Director Tasks."
Create a name for your coupon, an expiration date, the number available, how the coupon applies (per item or per cart), the discount type, and amount. Then choose the events for which the coupon is valid. Be sure to set your coupon code expiration date later than the last event for which it is valid. See How to Setup Coupons? for more details on creating coupons.