Hello,

This is not currently possible, as to be able to shorten the description, the html tags are filtered to prevent broken HTML.
Only a few HTML styling tags could be kept, but not yet the "a" href tag.

About a custom field displayed in the list of events, this is in my todo list to add this possibility in the future, and to be able to select which one to be displayed (not all functions to allow this yet coded).

So, 2 things in my todo list (with many other ones in process or planned!)

Best Regards,
Cyril