The actor announced the reunion, which will take place on 4 October at 6pm, from her official Twitter account.
It will feature Veep stars including Louis-Dreyfus, Anna Chlumsky, Reid Scott, Sam Richardson, Tim Simons, Tony Hale, Clea Duvall and Matt Walsh, along with some surprise guests.
The event will be moderated by David Mandel, an executive producer on the show.
“All roads to the White House go through the great state of Wisconsin. Trump can’t win re-election if he doesn’t win Wisconsin,” Louis-Dreyfus said in a video.
I’m SO excited to announce that we’re doing a #VeepReunion on Oct 4 with @AnnaChlumsky, @Mrreidscott, @SamRichardson, @MrTonyHale, @CleaDuvall, @MrMattWalsh, @DavidHMandel and more!
Chip in any amount to sign up! https://t.co/59it8U60A5 pic.twitter.com/7Wx1Mi88K2
— Julia Louis-Dreyfus (@OfficialJLD) September 26, 2020
“So, the democratic party of Wisconsin has built an unprecedented voter mobilization operation, and they need resources in these final days to deliver Wisconsin to vice president Joe Biden and Senator Harris.”
Wisconsin will be a crucial swing state in this year’s election. As well as the Veep reunion, the Democratic Party of Wisconsin recently hosted a table read of The Princess Bride, which raised more than $4m (£3.14m) in donations.
“The future of democracy is on the line, people,” Louis-Dreyfus said. “Come and join us and be part of winning Wisconsin, taking down Trump and electing Joe Biden.”