Because the government shut down around then in December so a few days later we were able (because all reservations were cancelled in all National Parks from Yosemite to Yellowstone to Volcanoes National park in Hawaii on the big Island. So, this is what personally happened to me. We were able to schedule a wedding, get reservations for about 14 of us at the Yosemite Lodge, get married at the Yosemite Chapel (built in the 1800s) and schedule and have a wedding reception at the Ahwahnee Hotel (all within one week's time because of the shutdown. So, the government kept shutting down (which closed immediately all National parks (then suddenly it would open for a short time) then shut down again). So, what happened to us is our wedding and reception came off without a hitch within a weeks time of making a reservation. However, then when we did a Fly and drive from Oahu at Waikiki and Honolulu Airport to the Hilo Airport and got our rental car, Volcanoes national park (the main reason we went there) was closed. So, our wedding was perfect but we couldn't go see the volcano going off into the sea. But, we could see in the distance the smoke of the volcano coming up out beyond the National Park. This was my personal experience during the Government shutdowns caused by New Gingrich who was then Republican Speaker of the House then.
This time if the government shuts down it will be Trump shutting it down where no National parks are open and various other things happen like Government employees not working or getting paid unless they are vital to national security somehow.
At the bottom of this page (likely without some of the pictures and other things) you will find an easier copy to read that I filtered through "Notepad" which is available pre loaded on most apple Iphones, Ipads and computers these days.