A broadcast can be used to send an update of irregular events, like a special offer in the restaurant.
Broadcasts are built in much the same way as Campaigns, which you can read about here: Campaigns (Guest Journey)
To create one go to Broadcast in the menu to the left or use this link: https://platform.bookboost.io/#/broadcasts
When you create a broadcast you will see that, compared to a Campaign, the Trigger had been replaced with Time.
You have the option of sending the broadcast immediately, as seen in the image above, or to schedule it for a specific date and time, as seen in the image below.
The rest of the process is the same as when building a Campaign.