Is there more to say about Doug Aitken‘s “Song 1?” Briefly, there is: The 360-degree projection has been extended to May 20. It was originally set to end this weekend.

Also, this Friday’s “Happening”—-for which the museum will turn off the soundtrack to the massive installation and allow a handful of Pitchfork and Wired-approved acts to perform—-now has a full lineup. Geologist and the pair of Tim McAfee Lewis and Leo Gallo will perform along with High Places, No Age, Oneohtrix Point Never, and Nico Jaar. Geologist, you’ll remember, is the lone D.C.-residing member of Baltimore-bred experimental-pop favorites Animal Collective—-a band that (so much news!) just released a pair of new songs.

A symposium inside the museum Friday will feature Aitken, David Allin, Aaron Betsky, Geeta Dayal, Sasha Frere-Jones, Dean Kuipers, and Zabet Patterson. Did you check out that new side-scrolling Hirshhorn website? It’s sleek and pretty, if a little buggy on first pass. They’ll figure it out.