A comedian, an actress and an MP are among more than 100 people expected to join a fancy dress protest to protect a library from closure.
The sit-in demonstration is being held at Coppull Library in Chorley, Lancashire.
Lancashire County Council plans to reduce the number of libraries from 74 to 34, saving £7m.
The libraries involved have not yet been identified, but there are fears Coppull Library will be among them.
Among those attending will be comedian Dave Spikey, Chorley MP Lindsay Hoyle and former Emmerdale actress Kay Purcell.
Spikey, who will give a reading at the protest, tweeted: “We all have a serious obligation to save our libraries. It’s a no brainer. Please support.”
There will also be poems and stories and people are being encouraged to dress as their favourite fictional characters.
Lancashire County Council is running a consultation ahead of its budget being set.