By CAROLYN BROWN Staff Writer All the world’s a stage — but for two local comedians, their stage is a green and black bus.

Ronny Chieng, Gary Gulman and other comics are experimenting with long buildups that can be audacious … when they work.

Paul D’Angelo has gathered other comedians for a fundraising event at Giggles Comedy Club Thursday in support of Patty Ross.   “Patty was one of the best comics to come out of Boston. She was a great ...