Step 1: Go to the app in the events calendar and select the day you want to book an event
Step 2: Go to the event and click on "Continue"
Step 3: Choose a product you want to use to pay for the course
Step 4: Click on "Next" to see the payment
Step 5: Click on "Next" again to check your data
Step 6: Click "Next" one last time to go to the payment method
Step 7: Confirm this by accepting the terms and conditions and clicking on "Purchase"

And the booking is done!