We have automated email marketing campaign surrounding our event series (22 events in 20 countries.)
Part of this was an automated email asking delegates to choose one of two training streams at each event - so we added 2 new status in the Marketo EVENT program Confirmed1 and confirmed2 to indicate which session they have opted to attend.
However - none of these delegates are now appearing in the checkin app - presumably because the app only recognises 'registered' as a field to add them to the list.
How can I make the check in app work - apart from 'unsynching' the event from salesforce, disabling my auto scheduled emails and manually changing all the status's back to 'Registered' the day before the event? which with 22 separate events is extremely cumbersome!
So the ipad/app statuses must be set in Admin > Tags > Channel. As you noted, you must then mark a status as available in the App, and you can only do Registered, Attended, No Show essentially. You cannot have customized Attendance statuses. Marketo isn't a good place to use Sessions booking unless you want multiple Programs.
What you could do though is set a temp field like Session Chosen, mark this when they Register, and then use a trigger like