Conversation so far:
How did Dennis from the Beach Boys die?
He fatally drowned at the age of 39 in Marina del Rey while diving from a friend's boat.
When did Dennis from the Beach Boys die?
On December 28, 1983, he fatally drowned.
Was Dennis Wilson with the Beach Boys when he died?
With the rest of the band fearing that he would end up like Brian, Dennis was given an ultimatum in November 1983 to check into rehab.
Did Dennis Wilson check into rehab after the Beach Boys told him to?
Dennis checked into rehab for his chance to get sober.
What did the Beach Boys do after Dennis Wilson's death?
The Beach Boys spent the next several years touring.
Did the Beach Boys perform anywhere else during the time frame after Dennis Wilson's death?
Carl continued to perform with the band on its 1997 summer tour.
What was the reception of the Beach Boys performances after Dennis Wilson's death?
In 1988, they unexpectedly claimed their first U.S. number one single in 22 years with Kokomo“.
What songs did the Beach Boys perform in the 1980s?
Did the Beach Boys perform anywhere else in the 1980s?
From 1980 through 1982, the Beach Boys and the Grass Roots performed Independence Day concerts at the National Mall in Washington, D.C.

Question: Did they perform in DC after 1985?
Self-contained rewrite: Did the Beach Boys perform in DC after 1985?