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This is just announcing Def Con 28

When:
Thursday, August 6, 2020, 7:00 AM to Sunday, August 9, 2020, 5:00 PM

Information:

This year will be completely online. Check out the official Def Con forums and Discord for more information.

https://defcon.org/html/defcon-safemode/dc-safemode-index.html

https://forum.defcon.org/node/231984