An article in today's Express mentions cartoonists as being included in the Season's Greetings exhibit at the Archives of American Art in the American Art building on 9th and F Sts, NW. If anyone beats me to the exhibit, let us know who's in the show, since the website doesn't.
In the comments, we are informed (presumably by an AAA staff member):
Everett Charles Hart
Michael Ponce de León