Hey there @MGR - thanks for your post! This is a fairly new feature with a lot of great information I can provide to you so that you can ensure you are setting things up correctly! Please forgive me for posting such a long response, below - I think it’ll be worth it in the end! If this does not help you resolve the issue please come back and tell me more about what’s happening - are you editing holidays from the event type level or the account level, for example? Then we can dig deeper!
Here we go! 🤗💃💪🏼
What if a holiday is missing?
If there is a holiday you observe that is not within your holidays tab or you are looking to block off additional dates within Calendly, you can add add date-specific hours to your Calendly schedule or you can add an all-day busy event to your connected calendar . Within your connected calendar, you can create busy events to remove availability for vacations and time off.

I hope this helps! Let me know if you’re still stuck after all that - I’m here all day!
P.s. check out our New User Guide! It’s a great source of tips + tricks while you learn the ropes!