"#TamrielTogether also features a host of in-game events, including the Undaunted Celebration starting Dec 3rd and the New Life Festival starting Dec 17th. Come celebrate our Tamriel—together." - from email
On the #TamrielTogether page (https://www.elderscrollsonline.com/en-us/tamrieltogether)
which says Nov 25 to Dec 8.
So, when does the Undaunted Festival really start and end?