/usr/share/dbus-1/services/org.gnome.evolution.dataserver.Calendar.service is in evolution-data-server-common 3.10.4-0ubuntu1.6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [D-BUS Service]
Name=org.gnome.evolution.dataserver.Calendar4
Exec=/usr/lib/evolution/evolution-calendar-factory
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