NEW YORK — With “Family Guy” and Ted creator Seth McFarlane welcoming attendees with a R-rated musical number in which he took aim at every OTT competitor to Peacock by declaring “NBCU has the shit you’re after” to Chairman of Global Advertising and Partnerships Mark Marshall riffing on Love Island in a video sequence showing him shirtless ahead of arriving on stage in an Oz-like setting to promote the “Wicked” sequel from Universal Studios, NBCUniversal opened Upfront Week at Radio City Music Hall with a tart tongue and bravado.