Fatal Error: Cancel/Delete attendance From RSVP - Events+

I am trying to remove a user from an event. On the event page under "Event RSVPs" when I try to Cancel attendance or
Delete attendance entirely I get the error message:

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 55198 bytes) in /home/content/35/11098935/html/wp-content/plugins/events-and-bookings/lib/class_eab_template.php on line 267

What is the best way to remove someone from an event? I had two spam registrations and its throwing off our numbers.

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