The phrase "opening monologue" refers to the first speech or presentation given by a person, usually at the beginning of a show or event. Full definition
During Felicity Jones» opening monologue on Saturday Night Live, Tina Fey stopped by as a Leia - inspired hologram to offer some advice. (themarysue.com)
This year's ceremony is hosted by Seth Meyers whose opening monologue directly addressed the sexual harassment scandal to have rocked Hollywood in recent months, dishing out a joke about Harvey Weinstein which drew gasps from the audience - you can find a compilation of his best jokes here. (independent.co.uk)