delete hackathon info

README.md

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 ## Join the organization by clicking the 'Request to join this org' button on the top-right corner
 
-- We would like to invite you to the **SF Hackathon**, a open source AI event in SF on March 31st at 6pm EST. The event will take place over one week online and in person on Friday, **starting from Wednesday, March 28th** and **ending on Wednesday, April 5th**. 
+- We would like to invite you to the **SF Hackathon**, a open source AI event in SF on March 31st at 6pm EST. 
 - We will be organizing this event here on <a href="https://huggingface.co/SFHackathon" target="_blank" style="text-decoration: underline">Huggingface Hub</a> and will be communicating with participants through the <a href="https://discord.gg/YtB7bm2H" target="_blank" style="text-decoration: underline">HuggingFace Discord Server</a>. Check the dedicated SF hackathon channel to stay updated with the event. Prizes will be given at the end of the event. See the Prizes section below. 
 
 ## Hackathon Tracks :