Ch Supt Hassan Khan of Lancashire Police said there will be some disruption to traffic in the city.
It is expected to be very busy and people are advised to allow extra time for their journeys.
There will be road closures and diversions in place by Lancaster Castle from about 06:00 BST.
Barriers and restricted access areas have been created to allow for public viewing and event safety.
Car parking bays on St Mary’s Parade will be suspended until 21:00 BST., while Dallas Road car park will be closed from 06:00 until 18:00 except by prior arrangement.
Residents and business owners in the Castle Hill and Castle Park area have been contacted directly with details of alternative arrangements.
Those expecting deliveries have been told to reschedule for another day.
HGVs will not be able to gain access to areas adjacent to St George’s Quay due to road closures and the low railway bridge on the quayside.