This file is indexed.

/etc/calendar/default is in bsdmainutils 9.0.12+nmu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/* This is the system-wide default calendar file, used if calendar(1)
 * is invoked by a user without a ~/calendar or ~/.calendar/calendar file.
 * It may be edited or even deleted to reflect local policy.
 *
 * In the standard setup, we simply include the default calendar
 * definitions from /usr/share/calendar/calendar.all.  If you want
 * only some of those definitions, copy calendar.all to /etc/calendar
 * and edit it there.  That way, your changes will be kept next time
 * you upgrade.
 *
 * The search path for include files is:
 *   /etc/calendar
 *   /usr/share/calendar
 */
#include "calendar.all"