You can choose your country and region / state. The app knows which holidays are usually days off in your regions. These holidays are displayed in red automatically. You can also have holidays from other countries displayed in your list.
When you travel in Europe it will be useful to know when there are school holidays in the different countries, because these dates ar typically fixed for all schools and many people will be travelling then, so flights and hotels may be expensive.
This free version is ad supported and has less features than the original "Holiday and Vacation Calendar" which will hopefully appear soon in the Android market.
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