Book the court or the function room, cancel if you cannot make it and invite outside guests.
If your community has bookable common areas (a padel court, the pool, the function room, the gym), you can book them from the application and bring guests in with a QR code pass.

The booking appears in your list with a QR code. Show it if the community has access control on that area.
Each community sets its own rules: how many bookings you can hold at once, how far in advance the calendar opens, or whether there is a weekly limit. If the system will not let you book, you have usually hit one of those limits.
If you end up not using the facility, cancel as early as you can: open the booking in your list and click Cancel. The slot goes back into the pool for other residents.
Cancelling in good time matters in communities where demand is high; some penalise bookings that are neither used nor cancelled.
To bring in someone who does not live in the community:
The guest shows the QR code at the entrance and the pass is validated. Passes have an expiry date: they only work for the day they were issued for.
Guests you register are linked to your account. You are responsible for their behaviour in the common areas, so do not share passes with people who will not be coming with you.