Update index.md

Author: eeholmes

ohw25/index.md

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 OceanHackWeek 2025 (OHW25) will be held on **August 18-22, 2025** in Seattle, WA USA. The US event will take place at the [UW School of Fisheries and Aquatic Sciences](https://fish.uw.edu/).
 
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 [Applications are open](https://docs.google.com/forms/d/1Mb72g93TySkyG_ls1Ql_wGEgynbUTI1YF_QJm4Mivv0/viewform?edit_requested=true) through July 14th.
+-->
+**Applications closed. Decisions by July 21.**
 
 The OceanHackWeek program consists of hands-on tutorials, visual presentations, and collaborative hack projects throughout a 5-day period.