The pair confirmed their engagement in November and said the service would be at St George's Chapel, Windsor Castle.
On Friday (15 December) Kensington Palace announced that the wedding will take place on Saturday 19 May 2018.
Celebrating, Simmonds took to Twitter and explained to the UK Home Office how the wedding could prove beneficial to pubs up and down the country.
"A Royal wedding is a great national celebration, and a wonderful opportunity for us all to get together in the pub," she said.
"I know this would be warmly welcomed by pubgoers and the pub trade. It would put pubs at the heart of the celebrations, something which has been a great success for previous major Royal events.
"I hope the Government will embrace this idea.”
Past national celebrations where the government has successfully used the ‘special occasions order’ have included the Royal Wedding in 2011, the Queen’s Diamond Jubilee in 2012, the 2014 World Cup and the Queen’s 90th Birthday in 2016.