Could you tell me how to dispose of big size’s furniture? (I don’t live in the US)

I am planning to participate in an exhibition at the Jeorge R. Brown Convention Center. I will be purchasing some furnitures from IKEA to use during the exhibition period. However, I'm unsure how to dispose of the furniture after the exhibition ends. Since it will only be used for a few days and is still in new condition, I would like to give it away for free to anyone who might need it.

Unfortunately, as a foreigner, I cannot use Facebook Marketplace. How do people living in the United States usually dispose of such second-hand items? Or Is there a company that collects recyclable items?

I want to know the proper way to handle this. Please give me a good advice.