Why do holidays appear more than once?

When in the calendar app click Calendars in the upper left. Scroll through the list you see. You will probably notice you have the Holiday calendar checked from more than one source. Uncheck any extras and you will be good to go.

Have you subscribed to multiple calendars - I have both the US Holiday calendar and the Obama Reelection Calendar on my iPhone which caused things like Presidents dy to apper twice - but with 2 different color dots to incidate they came from different calendars - so multiple calendars with the same holidays may be why this is happening

Had the same problem. My situation was that I have and iPhone and an iPad. Both were subscribed to "US Holidays" and both were synced to the same iCloud account. The solution was to unsubscribe one of the devices from "US Holidays".

I have the new iPad and iPhone 5

both run on ios 6

I have multiple holiday calendars on both devices

Step 1: delete your gmail account and calendars go away

Step 2: DELETE your icloud account under setting on iphone and select also delete on iphone

Step 3: add Gmail and Calendar by following directions below (you will NOT get multiple google calendars)

Step 4: go back under setting and sign up for icloud again and turn everythin you want on, ON, even Calendar

You are done, no multiple calendars

**I struggled for a week with this issue and researched online and tried other methods such as unchecking default Birthday icloud calendar, hard reset, uncheck holidays in Gmail, on iphone, none of it worked.....what worked were Steps 1-4 above!!!!)

My iphone 5 is perfect now..no 20 of the same holidays in one day!!!

By the way if you want multiple Google calendars to show up do it this way:

First of you are a gmail user, do NOT use the default gmail sync option if you want ALL of your calendars from Google to show up, multiple colors etc); use MS Exchange, server address is m.google.com

Then go to m.google.com/sync to sync your iphone calendar ON YOUR IPHONE BROSWER, you check mark the calendars you want

Presto, your Google calendars -- all of them -- show up