u/Key-Bar-491

https://www.frederickrunfest.com/Race/MD/Frederick/TheFrederickRunningFestival

https://www.frederickrunfest.com/Race/TheFrederickRunningFestival/Page/ScheduleofEvents

I am not involved with this in any way just a resident who likes to know when a few thousand people will be heading downtown. Something to be aware of if you live nearby or you're planning to be downtown this weekend.