The UK markets will be closed in observance of the Summer Bank Holiday. I guess that makes sense.
Next Monday September 2, the US and Canada will have the day off in observance of Labor Day, which kind-of does not make sense (No work on Labor Day).
Partly sunny skies will with highs of 23°C and lows of 15°C, with little chance of showers in and around London. It sounds like a perfect day to enjoy family and friends, have a few pints and something on the barbecue.
Enjoy the day off