With more than 8000k Events & Attractions listed on the site.
Things to do outdoor and indoor play in the UK, ideas for great family days out with kids in England, Scotland, Ireland and Wales – tourist attractions in Great Britain.
Some events:
https://www.justbookitnow.com/categories/family-friendly-days-out
Some other
https://www.dayoutwiththekids.co.uk/things-to-do
https://www.visitbritain.com/gb/en/best-annual-events-britain-2019