https://louisvillepizzaweek.com/
Last year we did this, and hit six different pizza places, all ones that either we had never heard of or that we had wanted to try but hadn't yet . . . two are now on our "rotation," and one is geographically inconvenient but if we're out that way is a must!
I recommend it to all!
From the list, there are only 13 this time around, although the map shows 20; not sure which is right.
In brief, every place listed has at least one pizza (some specials, some "your own thing") at $8 for a 12-16 incher (depending on the restaurant). Definitely a worthwhile experience, as I have nothing to do with the event other than as a hungry eater!