Debates in a Grand Committee takes place on a motion that "the Committee has considered" the statutory instrument. This is the most common form of debate in the House of Lords for statutory instruments before the question to approve the instrument is made in the Chamber.
Actualise this step when it is scheduled on the Parliamentary Calendar or Future Business so it appears in 'Scheduled upcoming stages' on the workpackage page. The link will need to be updated once the debate has taken place. If it's rescheduled, change the date.