When the participant submits the registration form, s/he is sent an email with a link to access the THATCamp Gainesville site. However, when s/he click on the link, s/he get the following error message on the website: “You attempted to access the “THATCamp Gainesville 2014” dashboard, but you do not currently have privileges on this site. If you believe you should be able to access the “THATCamp Gainesville 2014″ dashboard, please contact your network administrator.”

Meanwhile, that person’s registration form is not recorded in the system so the admin for THATCamp Gainesville can’t approve the new registration and give the user access.
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I looked up the general error message, and one post suggested the issue was browser/cache/plugin related, and another suggested going in as network admin(?) to add the user:
premium.wpmudev.org/forums/topic/you-do-not-have-sufficient-permissions-to-access-this-page-1#

wordpress.org/support/topic/you-do-not-currently-have-privileges-on-this-site

Any trouble shooting suggestions are welcome.