Within Outlook you can add holidays for the UK as well as other countries which can help give you visibility of holidays, festivals or religious events from around the world. This can help drive conversation about things that might matter to people in your team you otherwise might not know about. For example I recently learned about Fat Thursday or Tłusty Czwartek celebrated in Poland ahead of Lent. You can add them in Outlook by going File > Options > Calendar > Add Holidays…