guising

verb

1. (form-of, gerund, participle, present)present participle and gerund of guise

noun

1. (historical)A festival at which people disguised themselves in costumes and often played pranks.

   “[I]n more genial ages, your Christmas Guisings, Feasts of the Ass, Abbots of Unreason, were a considerable something: sincere sport they were[.]”