- Fans must agree to a new code of behaviour that includes not attending if they potentially have symptoms of coronavirus or have been exposed to a person who has tested positive
- Social distancing must be observed in seating arrangements
- Crowd management plans should be in place, including the controlled entry and exit of fans and one-way systems
- Additional hygiene facilities should be installed inside venues, particularly at entrances and exits
- Screening procedures should be considered at stadia entrances.
Pilots will take place from 1 August but any stadium reopenings would be subject to coronavirus guidelines.
Some sports, including football and cricket, have resumed behind closed doors after the Covid-19 lockdown.
"We will pilot larger gatherings in venues like sports stadiums with a view to a wider reopening in the autumn," said Johnson on Friday.
"From October, we intend to bring back audiences in stadiums.
"Again, these changes must be done in a Covid-secure way, subject to the successful outcome of pilots."
The pilot projects will be held at:
Two men's county cricket friendly matches - including Surrey v Middlesex at The Oval on 26-27 July;
The World Snooker Championship at Sheffield's Crucible Theatre from 31 July;
The Goodwood horse racing festival - known as Glorious Goodwood - on 1 August.