It looks like this was just released today:
Here is the summary:
NCAA announces March Madness preliminary round dates
Four First Four games will tip-off the 2021 NCAA tournament on Thursday, March 18. Turner Sports and CBS Sports to broadcast all 67 tournament games beginning March 18.
www.ncaa.com
Here is the summary:
- First Four (March 18th, Thursday... not the usual Tues/Wed) at Purdue and IU (Mackey Arena and Assembly Hall)
- 1st Round (3/19 and 3/20, Friday and Saturday... shifted by one day) at Bankers Life Fieldhouse, Hinkle Fieldhouse, Indiana Farmers Coliseum, Lucas Oil Stadium, Mackey Arena, and Assembly Hall.
- 2nd Round (3/21 and 3/22, Sunday and Monday) just at Bankers Life Fieldhouse, Hinkle Fieldhouse, Indiana Farmers Coliseum and Lucas Oil Stadium.
- Sweet 16 (3/27 and 3/28, Saturday and Sunday... shifted by 2 days) at Bankers Life Fieldhouse and Hinkle Fieldhouse.
- Regional Finals (3/29 and 3/30, Monday and Tuesday) at Lucas Oil Stadium.
- Final Four (4/3 and 4/5, Saturday and Monday... as usual) at Lucas Oil Stadium.