Hi, I live in South Africa and with our multi cultural nation there are many days that your calendar shows that are important days for the different religions and cultures, but are not "official" public holidays according to government.

I would suggest that some filter so users can at least decide to see only "official" public holidays or all like you have now.

First prize would be to have checkbox filter by category for example:
* Official Public Holidays and Observances
* Christian Holidays and Observances
* Hindu Holidays and Observances
* Islamic Holidays and Observances

Thank you for the great work you guys do! Keep it up.