Speedating still effecting community though Turned Off

Our Speed Dating feature is turned off through the admin.
When a user joins an event (to show they plan on participating or attending), an auto email sent thanking the user for buying a ticket to a speed dating event!

Is that the only purpose for the Join action, or can it be repurposed for an attendance list.
Or do you disable the auto email or change the text atleast?
Where to change the Join confirmation message that says "Thanks for your purchase..."

There will be no event purchasing off our calendar.

When the admin adds events, the forms asks for the ticket sales and pricing info. This is no necessary for our community. How can we remove those options.