The managing director of Silverstone has admitted that this year's British Grand Prix "is not a given" even without spectators.
Formula One plans to start the season, with two races behind closed doors in Austria in early July before potentially two more at Silverstone.
However Stuart Pringle has acknowledged that they would need approval to stage events from the UK government.
"The end of April for us was if we had to start putting up temporary infrastructure for hospitality and dealing with the public and stuff," Pringle said of their preparation plans for the Grand Prix.
"We are only working on fixed infrastructure now so it's an awful lot less. I'm confident we could operate well within F1's decision-making cycle. I think they are the ones who have got to make the decision.
"In the discussions within sport, about restarting in the UK, there's been talk about the need for sites to be a bit like an island. To be controlled. We can achieve that.
"We have all the facilities we need inside the circuit with the exception of a complete hotel. We have a half-built hotel, if that helps anyone."
Pringle's comments follow Formula One's managing director Ross Brawn claim that the sport wants to create a "kind of biosphere" at circuits:
"Austria fits that bill very well. It's got a local airport right next to the circuit, where people can charter planes into. It's not too close to a metropolis, it has a great infrastructure around it," Brawn told the official Formula One podcast.
"There will be no motorhomes, but there will be a full catering facility laid on that the circuit has."
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