American Red Cross offers incentives for blood donations between Apr 29 and May 19.

The American Red Cross encourages eligible donors to maintain a stable blood supply in the weeks leading up to May, offering incentives such as free haircuts, a chance to win a NASCAR race experience, and a $10 e-gift card to those who donate between Apr 29 and May 19. Booking an appointment can be done through RedCrossBlood.org, calling 1-800-RED-CROSS, or via the Red Cross Blood Donor App.