Participants register to attend the Google Calendar event via Google Form
To see your subscriptions, first you need to open your Form and open Configure box - Configure Booking Calendar.
(You can do that by follow step 1 to step 3 in section 2 from installation guideline )
Then, you go to the Help tab (The question mark symbol ), and you will see a letter icon. Click on it.
Here you can view all your available options. You can check or uncheck anything and remember to save everything after you finished configuring.