Guest board is a nice application for events. It helps you organize better; however, there is bug in the email invites. When the invitee accepted the invite using the email option instead of the Google Oauth, the page error 419 occurs, as a result, the invitee was not able to create an account nor view the event board. But in the guest list, the invitee is already attending. Page error for an RSVP invite is such a turn off.