Give blood. Have a milkshake.

In order to keep the donors churning in through the summer months, local blood bank We Are Blood is offering a promotion, starting yesterday, that will net donors a free P. Terry’s milkshake voucher. That offer is good at the group’s three centers or at its mobile drive. According to We Are Blood, donors must be healthy, aged 17 or older and weigh 115 pounds or more. The offer is good until Aug. 28. Find more information on the donor centers, as well as the mobile drive schedule, on the group’s website.