Sir the title is wrong, its not an airmen graduation ceremony, its passing out parade of aviation cadets, of PAF. Normally, graduation ceremony is always done 3-4 days prior to the parade, indoor, in the auditorium.
In grad ceremony, pilots, engineers, other branches cadets are awarded degrees.
Another thing is confusing. The flying badges are pinned to officers, i mean they are wearing already a pilot officer rank, before passing out and also they are in their ceremonial blue dress, unlike their parade uniform like other cadets.
one of the picture also show a foriegener cadet