Seattle Opera and Bloodworks Northwest are teaming up to present a May blood drive at the Opera Center, 363 Mercer St.  Members of the public can donate blood from 10 a.m. to 5 p.m. May 18 and from 9 a.m. to 5 p.m. May 20, 25 and 27. Appointments are required, and people can sign up at seattleopera.org/bloodworks or call 800-398-7888.

According to a press release, the country is in a nationwide blood shortage. In the Pacific Northwest, patient demand has increased 18 percent. Most blood types are at emergency levels.

The Seattle Opera pop-up event will be conducted in accordance with social distancing guidelines. No walk-ins, guests or people under age 16 are permitted onsite. Donors are asked to wear a mask/face covering.