https://abcnews.go.com/amp/Politics/trumps-inauguration-moving-indoors-due-weather-sources/story?id=117792480
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In an email to House offices, the House Sergeant at Arms asked congressional offices to tell constituents who had been given tickets that they are are now "commemorative" since the majority of those with tickets will no longer be able to watch the proceedings in person.."
"Trump posted to his Truth Social platform explaining the decision. "The weather forecast for Washington, D.C., with the windchill factor, could take temperatures into severe record lows. There is an Arctic blast sweeping the Country. I don't want to see people hurt, or injured, in any way. It is dangerous conditions for the tens of thousands of Law Enforcement, First Responders, Police K9s and even horses, and hundreds of thousands of supporters that will be outside for many hours on the 20th (In any event, if you decide to come, dress warmly!)" he wrote.
"Therefore, I have ordered the Inauguration Address, in addition to prayers and other speeches, to be delivered in the United States Capitol Rotunda, as was used by Ronald Reagan in 1985, also because of very cold weather. The various Dignitaries and Guests will be brought into the Capitol. This will be a very beautiful experience for all, and especially for the large TV audience!" he added."