If you tried to build GNOME Calendar on Fedora you’ve got error like this:
CCLD gnome-calendar gcal-event-widget.o: In function `gcal_event_widget_is_multiday': /home/brain/git/GNOME/gnome-calendar/src/gcal-event-widget.c:1033: undefined reference to `icaltime_days_in_year'
This is because bug in libical and fixed in 1.0.1 release (Fedora 20+ provides 1.0). What do you want? Update libical and libical-devel to new release. You can just enable my COPR repository (ignatenkobrain/gnome-calendar) and update/install that packages. Also you can install latest release version of gnome-calendar for repo, but it’s under heavy development and I’d recommend to try it using jhbuild.
P.S. We are going to have GNOME Calendar in Fedora 22+. You can track review request in RHBZ.