Very cute. Much better than the first half, I thought. A lot of good jokes, and some real emotional poignancy as well. Let's dive in.
The wedding is rushing forward, as Pepper convinces the firefighters to give them 30 minutes at the venue. However, just as they're about to get started, Sal (who was going to officiate their wedding) goes into labor. Phil volunteers to be the one to marry them, since he got certified online. However, the firefighters are back to say that the winds have shifted - they all have to evacuate right now!
Pepper finds a new venue, but that one falls through as well. Then they go back to Cam and Mitch's house. This also doesn't work out. Cam and Mitch are ready to call it all off, but then Jay comes in and says "you can't do this." Mitch is upset at first, but it turns out Jay meant that they can't have their wedding all cramped up in the house like this. He offers the country club as a suitable location.
While all of this is going on, chaos is erupting in every corner. Phil wants to do a magic trick as part of his officiating. In the end, he decides not to, letting the strength of Mitch and Cam's love be the focus. Claire continually insists that she's the "best person," instead of "best man," and gives a speech where she congratulates herself on being the best person. However, she also says how happy she is to know that Mitch is with a guy who will look after him just as much as Claire always has.