I believe Sir Ian McKellen is at some sort of gay event, which was apparently met with credulity which necessitated Zac to post evidence.
In the top right of the image, you can see "RO-" with what appears to be bear claws through the O, so I'd lean towards Roast being somewhere on the masc spectrum (also the topless hunks)
I’m too straight to speak with any authority on the topic but I thought bears/otters were hairier than this.
It could also be a gay venue or something.
But also Ian McKellen is quite public about being gay, isn't he? So essentially if you've ever fantasized about being topped by Gandalf... The chance is small, but not zero.
A roast is a large meatstuff (usually over 2 pounds) that is roasted in the oven
...he's a lucky fuck?..