I have created a registration history menu item that displays an individual members booked events but is it possible on the resulting view to display 2 additional (events booking) custom fields?
We do not support displaying custom fields on Registration History at the moment, so it is not possible.
If you want to have it displayed, you need to customize code of the file components/com_eventbooking/themes/default/history/default.php (but it requires query data from database, so I'm unsure if you know programming to do that)