No. A challenge event literally blocks it from being generated. It doesn’t reset anything. Petri’s comments.
We’ve had rare quests show up on a Tuesday one week and then on a Monday the following week, making it less than 7 days. So again, for all intents and purposes it’s 7 days and every calendar out there reflects that. It doesn’t need to be exactly 7 days if it’s weekly, that’s what “for all intents and purposes” means.
Anyways, like I said you can stick to your timeline. I’ll stick to my weekly/7 day “for all intents and purposes” schedule of rare quests. Have a nice day.