There is a UK publication Stamp Fair and Auction Diary which is published as a paper version every 2 months and has a corresponding web site https://www.stampfairsdiary.co.uk/
which is updated more regularly.
This gives details of most UK stamp fairs, societies, dealers etc etc.
If you ever have a query on UK material and want to find dealers or fairs to visit this is a great starting place.
Many of the dealers specialise in other worldwide stamps so always worth a look!
Often novice collectors in the UK flounder so start here to find information!