Here is a link to a UK Govt. consultation proposing that licensed premises in England and Wales should be able to open until 1.00 am on Saturday 19 May and Sunday 20 May 2018 in order to celebrate the Royal Wedding.
To make life easy, you can respond to the consultation via the online survey below, which should take all of 10 seconds to complete as you only have to tick four yes/no questions. https://www.homeofficesurveys.homeoffice.gov.uk/s/MQ6J7/
The consultation is open 4 February 2018