Starbucks' annual Red Cup Day is here, meaning customers have a chance to receive a special, limited-edition cup today only.

The coffee chain's annual giveaway could be impacted by labor relations at certain locations, however. Starbucks union members voted Nov. 5 to approve a strike across the United States on Red Cup Day unless a contract agreement is reached.

Here's what we know.

What does Red Cup Day mean at Starbucks?

On Thursday, Nov. 13, customers who order a handcrafted holiday beverage at participating U.S. Starbucks locations will receive a free, limited-edition grande (16 oz.) reusable red cup, while supplies last.

Starbucks said the red cup giveaway is available however you order, including in-store and via the drive-thru, as well as in the Starbucks app and S

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