Celebrities, pensioners, politicians and residents will bring Borehamwood's high street to a standstill on Saturday.
A march has been organised for 10am on Saturday morning, to protest against the planned closure of Cardinal Court.
People including actress Josephine Tewson, from the BBC's Keeping Up Appearances, will take part, alongside 102-year-old Cardinal Court resident Rose Cottle.
Miss Tewson said she had been horrified to learn that Cardinal Court was under threat of closure, as it had been the only facility she had been happy to place her elderly mother in.
"I thought it was the best place, and I thought people should start building them everywhere."
The protesters will assemble outside Hertsmere Borough Council's Civic Offices in Elstree Way at 9.45am on Saturday, February 9. All are welcome to attend, whether directly connected to the home or not.
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