For many activities no booking is needed. In some cases the partner needs to know in advance how many participants they should expect or have a booking system that needs details of participants to make the booking. You can sign up in advance by phoning or sending an email. If this is necessary you can see the information in the partner profile. Some courses offer an “instant booking” option directly in the app, you just need to click on the button to see if there is a spot available for you.