A post mortem write-up by steemitgraven29.

A “good event” has fast moving lines mixed with a feeling that the games are fair. Fair games punish everyone equally, or at least give them all the same RNG. So, in steps a tournament director (TD). That TD removes things from the game that the player would have used to their advantage.

Source: 2017 Pittsburgh Pinball Open Results — Steemit (includes links to video stream recordings)