Here are some websites that might be of use:

• Lancaster Archaeological and Historical Society
  http://lahs.archaeologyuk.org/LAHS.htm
• Lancaster and District Heritage Group: 
  http://lancasterheritage.org.uk/
• Lancaster Past and Present
  https://www.facebook.com/groups/336409379770446
• Friends of the City Museum, Lancaster:
  https://www.facebook.com/FOLCM/
• The City Museum, Lancaster: 
  https://www.lancaster.gov.uk/sport-and-leisure/museums/city-museum
• The Maritime Museum, Lancaster
  https://www.lancaster.gov.uk/sport-and-leisure/museums/maritime-museum
• Friends of the Maritime Museum, Lancaster:
  https://lmm-friends.org/
• Lancaster Civic Society http://www.lancastercivicsociety.org/
• Lancaster Vision https://www.lancastervision.com/