TBS will air a five-hour marathon with the best episodes featuring Stiller's iconic character, as a salute to the late actor.
The actor, best known for his role as Frank Costanza on 'Seinfeld,' passed away on May 11.
Louis-Dreyfus has been hosting past co-stars on her Instagram Live streams on Saturdays.
"Onward" is the latest Disney Pixar movie, featuring an all-star cast led by Tom Holland and Chris Pratt as elf brothers on a magical quest.
Marianne Williamson quoted Julia Louis-Dreyfus's famous "Seinfield" character, Elaine Benes, during the Democratic debate on Tuesday night.
"We are lucky to live in the age of JLD. Long may she reign," fellow female comic Lena Dunham said of the star.
"I was class of '79 & signed this letter," Louis-Dreyfus tweeted.