From SI Extra Mustard:

Across multiple webisodes, Kyrie Irving, or Uncle Drew, has worked to instruct “young bloods” in the stylings and virtues of playing basketball the “old school” way. On Tuesday night in Cleveland, Cavs fans, young bloods and old, will be able to show their appreciation.
The Cavaliers are offering free Uncle Drew bobblehead dolls with the purchase of an Uncle Drew dri-fit t-shirt.
While Uncle Drew and his crew have timeless wisdom, the bobbleheads and the t-shirts are available for only one night.
Irving has worked with teammate Kevin Love (“Wes”) and Nate Robinson (“Lights”) to put out the previous webisodes, sponsored by Pepsi.
In November, ESPN reported that Irving had agreed to make more of the videos, which have garnered more than 50 million views on Pepsi’s YouTube channel alone.
Whoever appears alongside Irving in the next installments of the series, fans are sure to be nodding along.