If your club would like to share the pitch and facility slot bookings for training and other events a Google Calendar is a good idea and its free! All you need is a Gmail address to setup 1 or more calendars which can the be shared publicly on your website and app. An example can be found here

To share a Google Calendar via a link, open Google Calendar, go to Settings and sharing for your calendar, and under "Access permissions for events," click Get shareable link. This allows you to copy and send a URL for others to view your calendar.

This Google link can then be shared:

ClubZap partners with SportsKey.com for online bookings for pitches and facilities. Please contact support@clubzap.com if you would like more information on this and an introduction to the SportsKey team.