Ostentation

The Lord Keeper only received society out of policy or ostentation, and was by nature rather reserved and unsociable.

In English, a group of peacocks can be called "an ostentation of peacocks"!

Tom did it all with characteristic ostentation.

Sir Henry had consumed his substance in ostentation and riotous hospitality—had fed many at his board, made many merry in his halls, but not a friend was in his house of mourning; the very retainers who had grown rich upon his ruin, seemed to deem the burial of their master but a signal for carousing and license.

Let her awhile be secretly kept in, And publish it that she is dead indeed: Maintain a mourning ostentation;