Hi, I encountered this 'is' usage in a book. Could you change it to 'are,' and it still feels idiomatic?
Gogol receives several dictionaries, several calculators, several Cross pen-and-pencil sets, several ugly sweaters. His parents give him an Instamatic camera, a new sketchbook, colored pencils and the mechanical pen he asked for, and twenty dollars to spend as he wishes. Sonia has made him a card with Magic Markers, on paper she's ripped out of one of his own sketchbooks, which says "Happy Birthday Goggles," the name she insists on calling him instead of Dada. His mother sets aside the things he doesn't like, which is most everything, to give to his cousins the next time they go to India. ('The Namesake' by Jhumpa Lahiri)The following is what I made up as a practice. Does the substitution of 'who' for 'which' make it sound odd? What about 'encompass' for 'encompasses'?
He then shakes the hands of more than one hundred people invited to the party, which he thinks encompasses all he has to meet that day.