Tango.info calendar

currently tango.info has no real calendar running

• iCalendar
• calendar software (incl. DPL calendar)
• tango.info wiki calendar
• tango.info events (old?)

• see also: datetime, ISO 8601

• http://www.simonhildebrandt.com/home/hintofthedaywikipediaandgooglecalendarmashup