Instead of using the (escaped) name of an event as key used in URLs, generate a number that is unique within the track an event belongs to.
Keep old urls with xxx.xxx.xxx/event/track-key-event-key-based-on-name functional by letting them redirect to xxx.xxx.xxx/details/track-key/num/name-of-paper, where name-of-paper is solely decorative.

Submitted by Elmer van Chastelet on 23 May 2019 at 13:15