There will be no races with public at all this year. Perhaps no races at all (or any other big sports). I will explain:
Half the world is coming to an abrupt halt not to stop rapid spreading. Not to stop normal spreading, because that is impossible. But to stop RAPID spreading. Countries go into full lockdow. The infection clusters become more isolated and smaller after some weeks. Yet there will still be new infections, but healthcare can deal with those amounts.
It is however impossible to go from full lockdown to normal business in a couple of months. Especially in dense populated area's. The release must be gentle and the infection/sickness rate will be more in line with the healthcare capacity.
What you do not want however, is 1 to 10 infected people at a large gathering like a footbal stadium, a concert, a F1 race, a large theather. Because from that moment on, uncontrollable infection clusters will spread again and you again need full lockdown to contain it. Once all is under control, sport should start, but without much public. A village football match can go on with the locals visiting, but you cannot allow a Champions Leaugue club to have a stadium full of people from all over the country. And that goes for any sport. This might even take the first 6 months of next year.
So I have no idea what the calender will look like. I expect the season to start in september, with 8 races in a place where you can actually race. Probably all in Europe to prevent travelling trough airports and keep the costs down for the teams.