WASHINGTON — Starbucks' Red Cup Day , often the busiest day of the year for the coffeehouse, arrives on Thursday.

On Red Cup Day, customers who order a handcrafted holiday beverage will receive a free, collectible, reusable red holiday cup at participating locations. The annual promotion typically draws long lines amid high demand.

This year's Red Cup Day could be affected by a possible union strike.

Starbucks Workers United members voted on Nov. 5 to strike at locations across the U.S. on Red Cup Day unless the coffee chain finalized a contract agreement. The union did not say how many stores would be impacted by the labor strike, but said workers in 25 cities planned to walk off the job.

Union members have yet to agree to a labor contract, leading to several labor actions against

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