The Queen celebrates one of her two birthdays at the Queen's Birthday Parade. Peter Macdiarmid /Getty Images

This weekend will feature some of the heaviest drinking England and Wales have ever seen, as pubs will stay open for an extra two hours until 1 a.m. on Saturday and Sunday, in celebration of the Queen's 90th birthday.

By amazing coincidence, two Euro 2016 championship games will be played on Saturday, June 11: Wales will play Slovakia at 5 p.m. and England will play Russia at 8 p.m.

So expect pubs to be rowdier than usual for those 48 hours.

It's going to be amateur hour across the nation, basically.

The official reason for the one-off extension of pub hours is that it's to celebrate the Queen's official birthday, according to an announcement from Prime Minister David Cameron, as reported by the BBC. "I'm sure that will be welcomed right across the House," Cameron told Parliament.

The Queen actually turned 90 back on April 21 — her actual date of birth. But her official birthday is celebrated on a Saturday in early June, so that it there is more likely to be good weather for the parades in her honour.

Unfortunately for Britain's landlords, rain is expected this weekend, meaning drinkers won't be able to take advantage of beer gardens and street-drinking. And Monday is a normal working day, so the late-opening bonanza on both weekend days is really going to test Britain's ability to shake off a hangover.

This isn't the first time pubs have stayed open later on a royal occasion. Pub hours were also extended on April 29, 2011, the day of the Duke and Duchess of Cambridge's wedding, and for the Queen's Jubilee in 2012, according to the BBC.