You can update any of the Event Info you entered during Event Setup at any time. Open your event from Dashboard, click on Setup and simply change the information in the fields you previously entered.
Doing this will automatically update the info as it appears on all guest ‘Your Registration’ pages, and the Register Page for your event. If you used Event Macros in your Email Invites and Confirmations, the info you changed will also automatically update in all emails sent out from the event from this point onwards.
If you have a change you want to proactively notify your guests about, you can send them an Announcement Email.