Because the league matches are generated by the system, all of the information on the diary is set by the system.
We've added a feature that allows you to enter some custom text onto the last line of the timeslot/booking.
On the diary, place the mouse over a league match and you'll see the option for Match info.
Clicking this leads to a pop-up:
Text entered in this box will display on the bottom row:
This is set to private normally, which means the text entered here is only seen by the staff with access to the system. But this can be set so the text displays on the Diary TV and Microsite, please ask the Bowlr Support Team for this change.