Flight
For anyone not up for the drive Mammoth Yosemite Airport is a short 15 mins from the campground and 15 mins from Mammoth mountain. This summer they provide flights from Hawthorne-LA airport (MMH) and Carlsbad Airport (CLD).
Hotel
This is where the ceremony will take place. Lots of sites are still available for the weekend of the wedding at this time. If you plan on camping I would reserve a site as soon as possible with summer approaching the sites can fill up. Brown's has multiple campgrounds so make sure to select Owen's river on the website when reserving.