Assertion: celebration | /r/HasProperty | a festivus dinner
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Source sentences:
text: The non-commercial holiday's celebration, as depicted on Seinfeld, occurs on December 23 and includes a Festivus dinner, an unadorned aluminum Festivus pole, practices such as the "Airing of Grievances" and "Feats of Strength", and the labeling of easily explainable events as "Festivus miracles.