When the St. Louis Art Museum closes on Sunday evening, they will stay closed for two weeks.
The museum is closing temporarily to prepare for the opening of the new east building expansion. When the museum reopens on June 29 they will have the have 21 new galleries that can display 230 works of art.
After opening ceremonies at 10AM on the 29th, there will festivities on the museum grounds that include food booths, a live musical performance, and hands on craft displays.
More info can be found at SLAM.org.