In the current version of matchplay.events, you get a random sequence of numbers and letters for the match play live link; but you're able to edit that portion of the vanity URL to choose a more meaningful URL. With the new version at next.matchplay.events, there is no vanity URL field and all tournament URLs just end with a number.

I like having a vanity URL for my tournaments because I'm able to keep them all consistent (I use "abbreviation-yyyy-mm-dd"). This also looks much nicer on the flyers that I print out telling new players where to go to find the matches and standings.