Heritage Open Day: Grimsby Town Hall Open Days Friday 19th & Saturday 20th September, visit the Time Trap Museum and discover Grimsby's past, see the Great Grimsby Family History display and find out about tracing your ancestors, as well as other displays. Visit the Great Grimsby Town Hall to see the Assembly Room and Banqueting Room, which have been returned to their Victorian Splendour following extensive conservation work, carried out by Hurst Conservation, and support from North East Lincolnshire Assets Team, Architectural Services and the Great Grimsby Charter Trustees. Also see the Bremerhaven Room (Former Court Room) and Crosland Suite.