masking

noun3

1. •
   The act by which something is masked; the act of masking, of concealing or disguising.

   • “To function effectively in any social situation,” writes Booth, “we all engage in masking of one kind or another: we do some prettying up: we adorn, […]" — 2017
2. •
   The practice of wearing safety masks, such as face masks.
3. •
   An entertainment at which the guests conceal their faces with masks.

   • Such things, maskings, and disguisings, and dressing up, sometimes in incredible and wild fashions, are all part of the fun of carnival. — 1984