update Submission Closes date

Author: QiLi111

index.md

@@ -41,7 +41,7 @@ The TUS-REC2025 Challenge is an open call event, accepting new submissions after
 | Apr. 28, 2025                   | Training Data/Baseline Code Release                            |
 | Jun. 23, 2025                  | Validation Data/Submission Code Release                          |
 | Jul. 07, 2025                  | Submission Starts                               |
-| Aug. 18, 2025                  | Submission Closes                               |
+| Aug. 31, 2025                  | Submission Closes                               |
 |  Sep. 01, 2025                 | Winners Announcement                               |
 |  Sep. 23, 2025                 | TUS-REC2025 Challenge Events at MICCAI 2025     |