That wasn’t what I was intending to propose at all, but you do make a good point that it would invalidate the option of limiting the “levelling up” events to players who’d already competed a season!
I used the example of a holiday party with my colleagues in mind, i.e., people who do not play pinball and therefore would be unrated and probably easier to win against. 
Since the five high score events would count as their “experience” events, they’d contribute to the value of the match play event, thereby making it worth a good number of points, depending on how many participants you had.
Our holiday parties are usually held in public spaces, so nothing stopping others from joining.
It reminds me of this exchange from the High throughput, easy to run tournament thread earlier this summer:
Btw, I’m not actually advocating for events that skirt the experience requirement, I’ve just identified a way they could be done under the current rules, if someone wanted to go through the effort.