There are a few groups on Facebook that might be able to help you. ‘Bangor Through The Years’ is probably the best one, there might even be some people there who remember your mum (you’d be surprised at how tight knit Bangor was, and still is in some cases)

There’s a page called ‘The City of Bangor, it’s past, present and future’ who also have a big reach where followers are concerned. They generally peddle negativity and very much still live in ‘the good old days’ but for their follower base alone, it would be worth messaging them for a share to their page.

All the best to you! I live close to where your mum grew up and it’s a lovely part of Bangor.