Joss Whedon has called all of his connections and then some to gather celebrities for this Hollywood-choddy on steroids. It's so aware of being a choddy, and mocks it mercilessly, that it seems a great SNL parody. Until someone says that you have to vote "because one of the two major-party candidates is a racist, sexist, moronic, loud-mouthed demagogue." That's when you suddenly remember that this is how people actually talk about this election, and we're currently living in something akin to a parody of reality.
So while Robert Downey Jr., Scarlett Johansson, Mark Ruffalo, Don Cheadle, Cobie Smulders and Clark Gregg, David Harbour, along with huge Hollywood names like Keegan Michael-Key, Oscar-winner Julianne Moore, and Bradley Whitford do their best choddy serious-ness to inform us how to register to vote, some non celebrities are thrown in for good measure. When the little latina lady shows up, I feel she represents how Hollywood actually see immigrants from south of the border - as a prop. While it is quite a funny version of the Hollywood elite telling us something is important, it's difficult to take it seriously when neither candidate would change these billionaires lives very much at all and the whole thing seems to be done on a lark.
P.S. To register to vote just Google it, and you will find how to online, in person and by mail specific for the state that you are in.