As explained in T334761, we need to record when an organizer agrees to the "clickwrap agreement" for each event. We decided that this information will be stored into a new column in the ce_organizers table. Even if the application doesn't need the timestamp at the moment, and a boolean would suffice, we decided that we're going to store the timestamp anyway in case it's needed later.

Acceptance criteria

• A new column is added to ce_organizer to store the timestamp (or null) when the organizer agreed to the agreement.
• The new column should be created in beta
• The new column should be created in production