Needed: a parking lot that is wider than it is deeper. Not heavy snow or rain or fog. Sound system (voice / music). Parking attendants. If Christian and offering (Sacrament of) Communion, each brings their own (bread / wine or juice) and clergy consecrates / blesses.
Process: everyone Drives-in. Parks, roll windows down. Attendants pass “whatever” – if Christian, for First and second Sundays of April – Palms, lilies, worship programs….passed through windows or left by vehicle. Officiant not in their vehicle, but, like a Drive-in screen – stands slightly above and central.