https://docs.pretix.eu/en/latest/development/api/customview.html?highlight=permission#event-settings-view

Previously the result of the first run was cached, subsequent
calls would receive the same result as the first call independently
of the conditional

The settings are then correctly deserialized and used as
initial values on the settings form

This assumes OrderPositions in canceled Orders are also marked as
canceled.

Currently limited to Gravatar based on attendee email and attendee name.