MachaaMaker:
In other words, if a group of people choose to play in traffic and, in the process, make an unprecedented chillul Hashem in doing so and Hashem is kind to them and some of the cars stop for some of them, then that’s not a reason to make a yom tov like a little Purim established in the past.
Regardless, these sevaras are irrelevant because the Chazon Ish and other gedolim considered it not a purim katan but, its polar opposite, a tragic day, like Tisha BiAv, and he deliberately said tachanun on “Yom haAtzamos” even when he had three brisos that morning.