Will there be a guaranteed seat since we have submitted this booking so early in advance? What if it comes to the point where we have the pass but insufficient seats? Are we able to board as well?

Once you have accepted the confirmation of your seat during the booking period, you will be guaranteed a seat for the service in next week. There will not be an instance where you have a valid boarding pass and not have a seat on the bus. Ensure that you have accepted your booking in the booking period.