Participating, individually or with a group of people, in the more active aspects of visiting art galleries. The verb encompasses both visiting galleries and criticising artworks regardless the styles of art.
A: "What have you done this weekend?"
Y: "I was gallering with Jimmy in Mayfair"
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.