​Calendar: Week of March 21

Here's a look at the week ahead on our "Sunday Morning" Calendar:

Monday marks the tenth anniversary of the world's first tweet sent by Twitter founder Jack Dorsey.

Tuesday sees long-distance swimmer Martin Strel's departure from Long Beach, Calif., on a round-the-world swim to promote awareness of the need for clean water. He plans to finish around July 4, 2017.

Wednesday's the day Washington, D.C.'s cherry blossoms are expected to enter their peak bloom period -- unless it's Thursday! Unusual temperature swings this month are complicating the National Park Service's projections.

On Thursday, the 43rd Daytime Emmy Award nominations will be announced on "The Talk" right here on CBS. The awards ceremony itself is scheduled for May 1.

Friday sees a free Rolling Stones concert in Havana, the first open-air concert in Cuba by a British rock band.

To hear the Stones perform "Can't You Hear Me Knocking," click on the player below.

And Saturday is the day for the Dubai World Cup, billed as the world's richest horse race with a combined prize purse of some $30 million.