The protest will be at 10am, immediately before the Nottinghamshire County Council pension fund committee meets at the venue.
Demonstrators will demand that the committee immediately sell their fossil fuel shares.
Dressed in black, protestors will lay down on the main entrance steps to enact a symbolic death scene.
In July, the council failed to pass a motion, brought by Coun Tom Hollis, to investigate divestment from fossil fuel funds that do not align with the council’s moral objectives.
Fossil fuels are performing poorly on the stock market which has a negative impact on pension payouts.
The UK’s biggest pension fund, National Employment Savings Trust, is already getting rid of its fossil fuel investments.
Rachel Adams, a retired council public health manager, said: “I’m a pensioner dependent on this fund and I feel for employees who will receive much reduced pensions.
"The value of these shares is already falling.
"Everyone recognises that, to prevent the horror of climate catastrophe, all reserves of oil, gas and coal must stay in the ground.”
Leora Hadas, a researcher at Nottingham University, added: “We’re already seeing the impact of the climate crisis – wildfires in America, floods in Sudan, heat waves here in the UK.
"The first essential step is to switch quickly to sustainable energy sources.”