The Red colored timeslots are the most urgent since there is nobody signed up currently.
The Purple colored timeslots are the second most needed
The Blue timeslots are the third most needed.
The Yellow timeslots are the lowest need.

The Red colored timeslots are the most urgent since there is nobody signed up currently.
The Purple colored timeslots are the second most needed
The Blue timeslots are the third most needed.
The Yellow timeslots are the lowest need.