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We just posted a pre-con calendar on the DEF CON 20 site, and I just wanted to let contest/event organizers know that if you have a date or deadline that is of note before con, hit me up and we'll see about getting it posted. my email is neil at defcon dot org
The calendar is at: https://www.defcon.org/html/defcon-2...-calendar.html
The calendar is at: https://www.defcon.org/html/defcon-2...-calendar.html