The phrase "knee surgery is tomorrow" is widely recognized as part of a popular meme featuring a blue-tinted Grinch character expressing the emotional state before knee surgery. However, there is no specific public information about an actual scheduled knee surgery happening tomorrow, August 31, 2025. The meme captures the nervous anticipation many feel before such a medical procedure, but it does not refer to a real event scheduled for tomorrow. If the question refers to a personal or specific knee surgery planned for tomorrow, that information would only be known through personal medical records or direct communication with the surgical provider. No public surgery events are scheduled for tomorrow based on available data. In summary, "knee surgery is tomorrow" mainly points to a viral meme popular for humor about surgical anxiety and not a known surgical schedule for tomorrow.