Hundreds of people are expected to take part in a rally and march over the future of paediatric and maternity services at the Northallerton's Friarage Hospital.
This is the latest event in a long-running campaign by local people and politicians opposed to cuts at the town's 200 bed hospital.
Earlier this month more than 300 people attended a public meeting which was part of a massive public consultation organised by health chiefs.
The Clinical Commissioning Group (CCG), chaired by Dr Vicky Playdell, is the body conducting the meetings and will eventually make a recommendation on what will happen to the services at the Friarage.
Local MP and Foreign Secretary William Hague is due to attend the rally and march.
Today's rally is due to begin at County Hall at 2pm. North Yorkshire County Council will make limited parking facilities available for the rally.
Additional free parking facilities have been arranged by the rally organisers at a number of locations around Northallerton . They include Hambleton District Council (Stonecross), BT Distribution Centre (Darlington Road), and Allertonshire School (Brompton Road). Two further car parks (fees payable) are at Northallerton Railway Station, and Northallerton Auction Mart.
The rally will be followed, at approximately 2.40pm, by a march to the Friarage Hospital by way of South Parade and the High Street. Rather than closing the roads, North Yorkshire County Council will control the traffic by means of a rolling road closure.