Updated Plugin and Lost Admin Access

Hello, I updated a plugin on the backend, and it caused my site to go down. At first the homepage went blank, but now it is loading the site. But I don’t have access to my admin – it tells me “you do not have sufficient permissions”. I have a large festival to attend tomorrow and need to be able to get in there. Any suggestions would be great.
Site: http://www.visitncwinecountry.com
Admin: http://www.visitncwinecountry.com/wp-admin