after you get your driveway clear of other's vehicles can you block your drive with bikes or something so noone can pull in but you? We used to do that when we lived in town. There is an annual Old Threshers and people would park in your parking or your yard without asking. I would take some stakes and run a chain or rope across your drive. Put no parking out there where people see it.
So sorry people are so rude at a time when you are suffering the loss of your friend. But this too shall pass. Hold on and it will be over soon!