Do you have plans for the longest day of the year? If not, consider spending it at D.C.’s biggest museums. The Smithsonian will hold its fourth Solstice Saturday next weekend, on June 25, and attendees can expect to enjoy free, in-person festivities all day and all night.

Smithsonian Castle, Enid A. Haupt Garden, Arts and Industries Building, National Museum of African Art, National Museum of Asian Art, and the National Museum of Natural History will all be open until midnight.

The Hirshhorn Museum and the National Museum of African American History and Culture will be open until 8 p.m. (At NMAAHC, passes won’t be required after 5:30 p.m.)

There’s plenty to do outside the museums, too. Starting at 5:30 p.m., festivalgoers can dance the night away at a party on the grounds of the Freer Sackler, featuring the music of D.C.-based DJ Ayes Cold. There will also be music in the Haupt Garden from 8 p.m.-11 p.m.

If you want to gaze up at the stars, Hofstra University’s Department of Physics and Astronomy, which is partnering with Smithsonian on the event, is hosting an astronomy festival on the National Mall across from the National Museum of the American Indian. Attendees will be able to view the solar system through a telescope and meet an astronomer.

View a complete schedule of events for Solstice Saturday here.

The all-day event has been running since 2018, with a few COVID-related speedbumps along the way. This is the first in-person Solstice Saturday since 2020.

Solstice Saturday falls during the annual Smithsonian Folklife Festival, whose themes this year are “Earth Optimism” and celebrating the culture of the United Arab Emirates. The two-week Folklife Fest offers even more free programming, which next Saturday includes a tribute to plena musician Tito Matos at 6:30 on the National Mall near 12th Street.