Calendar that aggregates events from many sources providing filters and a map.
Initialize the calendar with a list of Google calendar feeds like so:
sources = ['http://www.google.com/calendar/feeds/usa__en%40holiday.calendar.google.com/public/basic',
'https://www.google.com/calendar/feeds/habitat2030%40gmail.com/public/basic',
'https://www.google.com/calendar/feeds/vi7emldooebjk83viv63mmac74%40group.calendar.google.com/public/basic',
'https://www.google.com/calendar/feeds/qulevcs6r5qv1t6ooie2f9dhu8%40group.calendar.google.com/public/basic',
'https://www.google.com/calendar/feeds/c3mk91p1452cdm9umg24oaeeo4%40group.calendar.google.com/public/basic',
'https://www.google.com/calendar/feeds/fermilabnaturalareas%40gmail.com/public/basic'];
initCalendar(sources);