Sporting events and centers in England are beefing up security after 22 people were killed in an attack at Manchester Arena.
The Great City Games, an open and free event for the public, is due to take place in Manchester on Friday.
A spokesman for the organisers said: “We are awaiting advice from the authorities on these events and will provide an update as soon as possible.”
The FA Cup final, EFL play-offs and the PGA Championship are also this week.
An eight-year-old girl was among those killed in Monday’s suicide bombing at Manchester Arena, at the end of a concert by US singer Ariana Grande.
Manchester United cancelled a news conference on Tuesday, due to be held prior to their Europa League final in Stockholm on Wednesday.
The club said: “Our thoughts are with the victims and their families at this terribly difficult time.”
United’s players held a minute’s silence at training on Tuesday, and the club closed its megastore, museum, cafe and stadium tours to the public.
A staff event scheduled for Wednesday has been cancelled by executive vice-chairman Ed Woodward.
Manager Jose Mourinho said: “We are all very sad about the tragic events; we cannot take out of our minds and our hearts the victims and their families.
“We have a job to do and we will fly to Sweden to do that job. It is a pity we cannot fly with the happiness that we always have before a big game.
“I know, even during my short time here, that the people of Manchester will pull together as one.”
Aleksander Ceferin, president of football’s European governing body Uefa, said he was “deeply saddened” and shocked that “so many innocent people lost their lives”.
A Uefa statement said there was “currently no specific intelligence” to suggest Wednesday’s game could be a target for further attacks.
“Uefa has been closely working with local authorities and the Swedish FA for many months and the terrorist risk had been taken into account since the very beginning of the project,” it said.
“Furthermore, a number of additional security measures were implemented following the attacks in Stockholm last April.”