Don’t have time to read the whole thing. But a number people here are confusing Hilchos Aveilus with establishing a Yom Hazikaron. There is no Yom Hazikaron in Nissan for Rabbi Akiva’s talmidim. Only a general (pretty light version of) aveilus; hence the beard stubble.
The taanis of 20 Sivan was established in those communities, and was not meant for Klal Yisroel as a whole. As are similar memorials such as 20 Tammuz in Telshe, events like 21 Kislev in Satmar in others. Any specific individual or community has a right if not obligation to mark its own personal tzaros and yeshuos for its own hisorerus. (See last Perek in Maseches Brachos.) One can (perhaps should) establish a fast when he has yahrtzeit for a parent, however that does not override issurei Taanis, such as Chodesh Nissan.
We do not make special azkaros for the entire nation except 9 Av. That cheapens the true azkara of the source of all our Tazros. All Tzaros are sourced in the big Golus for which we have Tisha B’av. See Rashi in Divrei Hayamim II perek 23 or so, on the possuk Vayekonen Yirmiyahu al Yoshiyahu.
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