We are aware of a glitch with entering Bookings (Datings) on your parties and IT is actively working on fixing it. In the meantime, you can work around that error by selecting any date that has a blue underline; once the party is submitted, go back to that open party that was created by that dating and change the date to the actual date of the party. We will let you know once we have a timeline for a permanent fix. We appreciate your patience and apologize for any inconvenience this may cause.