To think it is outrageous to ban women and girls over 13 from a fun run?

Yes and that's what the religion is based on and the reality of women in the religion. And the fact this is allowed shows how far into Galiad we are sinking. Rules and values we fought for in the west do not apply. Women are chattel to be passed from a man to a man and having your tits jiggling and running alongside a man bring shame upon one.
We are becoming a third world country where women's rights are being fast erased and mysogyny is at unprecedented levels.
The level of harassment from men practicing that religion is unbearable too.
This is life in the UK in 2025. Women-hating "liberals" fascists will tell you it's okay and call you names while only mixing with people like themselves and knowing nothing about other religions and cultures and how harmful and incompatible with western values they are.
I mean what kind of an apology or justification can a twisted "liberal" mind even give for stuff like this.

So many threads started about this. Is it the first year that the event has run, or is it that there are far more powerful social media currents now that give impetus to any news hook for viral outrage about something connected with Islam?

Not saying that you as an individual are fomenting outrage, OP. Just wondering about the online tides that wash numbers of such threads onto MN. Some of the posts on one of the recent threads showed such strong hostility to Islam, much stronger than would have been expressed a few years ago.

What didn't you look for any of the other (at least 3) threads on this?