This excerpt taken from the SIRI DEF 14A filed Apr 23, 2007.
How often did the board meet during 2006?
During 2006, there were six meetings of our board of directors. Each director attended more than 75% of the total number of meetings of the board and meetings held by committees on which he served. Directors are encouraged to attend the annual meeting of stockholders. Messrs. Clayton, Gilberti, Holden and Karmazin attended and participated in our 2006 annual meeting of stockholders.