Group challenges - Point system

My friends and I have always enjoyed going out for a ride and sprinting for “town” signs. We’d sprint for town signs, animal signs, top of climbs, etc… 

We would tally things up and have a ride winner. It kept things fresh and exciting.

Would love to setup a ride with my group of online friends where we could do a ride with same sort of scenarios. 

Have a mode where the ride start would tally points, no matter what route we did or on a free ride.