In this video
We show more info to the user if the season dates are invalid.
Assignment: Require at least 1 Game Night
- Group together the game night controls
- Create a new formGroup in the form for game nights
- Mark all the checkboxes as invalid if there are no game nights selected
- show an error message about selecting at least 1 game night
- display all the checkboxes as red if there is no game night selected