Sounds like they are really dropping the ball with this. Absolutely ridiculous to require this. They specifically state that a negative test is not good enough. Even Boston is making Philadelphia look bad.
"We will be providing instructions on uploading your proof of vaccination next week (week of October 25)."
"Runners who paid to have their race packets mailed: you will need to upload their proof of vaccination in the CrowdPass portal by Wednesday, October 27th."
Yeah, I would email the race TONIGHT to be sure you get a response by Wednesday.
Info@PhiladelphiaMarathon.com