The IMSA SportsCar Championship in North America will resume with two behind-closed-door races at Daytona and Sebring in July.
IMSA will operate the pair of spectator-free races on 4 July and 18 July respectively using the same protocols in place for the events run by NASCAR at Darlington this weekend and Charlotte next.
What is being billed as IMSA's 'Back to Racing Plan' means that the Watkins Glen 6 Hours scheduled for 28 June has been pushed back and will now take place on 4 October.
IMSA boss John Doonan made the announcement on the resumption of the series that has so far run only its opening round, the Daytona 24 Hours at the end of January, in a virtual address to teams on Friday.
"We are very fortunate to be able to open our 'Back to Racing Plan' at two facilities that are in the IMSA property's family," he said.
"This will allow us to follow the event protocols that we have developed with our colleagues at NASCAR at two facilities we are very familiar with."
Both races will be of the regular IMSA sprint duration of two hours and 40 minutes.
The IMSA round set for the Canadian Tire Motorsport Park, formerly Mosport, is a casualty of the latest changes and has been cancelled.
The Lime Rock event, for the GT Le Mans and GT Daytona classes only, has been pushed back from mid-July to 31 October.
The rest of the schedule is unchanged from previously-announced revisions.
The Daytona and Sebring July events will be followed by Road America and Virginia International Raceway in August and then Laguna Seca and Mid-Ohio in September.
The rescheduled Watkins Glen and Lime Rock events sandwich the Petit Le Mans 10-hour enduro at Road Atlanta in October, before the season concludes with the rescheduled Sebring 12 Hours in November.
Doonan did not reveal when he expected the fans to be able to return to events, but stressed that IMSA "recognised the substantial responsibility that comes with returning to competition".
"IMSA will return to a racing environment that will prioritise the safety of our competitors and those in the local communities in which we race," he said.
"The detail event and operations protocols developed with our colleagues at NASCAR are the foundation of the framework what IMSA will use.
Doonan said that the plan to return to racing is focussed on a two-day event model, without saying how this might be modified for the endurance races.
This will result in cost savings for the teams, he explained, as well as reduced contact between personnel.
There will be strict limitations on team personnel: these have yet to be determined and are likely to be modified as the season progresses.
Doonan said that he expected shortly to have more detail on how IMSA's international participants will be affected by any restrictions on travel to the USA.
Revised 2020 IMSA calendar
25/26 January Daytona 24 Hours
4 July Daytona
18 July Sebring
2 August Road America
23 August Virginia International Raceway (GTLM, GTD only)
6 September Laguna Seca
27 September Mid-Ohio
4 October Watkins Glen
17 October Petit Le Mans
31 October Lime Rock Park (GTLM, GTD only)
14 November Sebring 12 Hours