Hey @sabrina.refurbed
Unfortunately you can only assign one public holiday per Office at the moment. Therefore the workaround would be to create another duplicate of the office to allow for a separate public calendar to be assigned to the respective employee(‘s).
I understand this can be a little messy having duplicate offices just to assign differing public holiday calendars, however I was able to find another user who posted a similar feedback to yours in the Ideation Area. I would kindly ask that you provide your feedback under this post and upvote this idea, to give further visibility to the Product Team.
If there is anything else I can help with, please let me know.
Best regards,
Conor