Calendar

Q: How to add national holidays to calendar?  

A: You can import holidays as iCal (.ics) calendar which can be downloaded from Internet.

Q: How to generate a list of upcoming birthdays and/or a list of all birthdays.  

A: You should switch calendar to Table view, filter tasks according to Birthday (Holiday) category and set date ranges. You'll get your list then.

Q: Is there a possibility to make a text search, among all appointments scheduled in the current period?  

A: Yes, switch to Table view, then you can make search by keywords and set date limits.