Side note about running for a charity:
DH ran the MW 10k in 2022 on a leftover MS bib (we paid the cost of the bib and a $50 donation) and since then the amount of solicitation mail we get is enormous. We have hundreds of return address labels now. And they're from all sorts of different organizations (DS, MS, Special Olympics, United Way, Shriners, ACS, etc.)
Also (and this is probably just a "thing" that happens to us because we are those "if it can, it will" people) we got a whole bunch of monthly thank you letters for our donations (of almost $800/mo!) that caused no small amount of panic that our card was being auto-charged without us knowing it, because when I signed him up I was essentially taking the coordinator's word for it that we wouldn't be charged the full fundraising amount later on. We were NOT being charged, which was a relief, but also super weird that for some reason their system thought we were donating thousands of dollars.