Hi Steph,
At this time there isn't a native setting to get the calendar report to default to a day by day view instead of the standard month view upon opening. I do think though that this is good feedback for our Product Development team. I would suggest adding this into User Voice as a customer feedback. User Voice is our user feedback platform which can most easily be accessed from the My Apps page in Quick Base by clicking on the orange Feedback tab or at
http://quickbase.uservoice.com. This forum is used by our development team to explore customer suggestions for enhancements / changes to the platform. Many of the items that have been suggested by customers have already been incorporated into Quick Base and I would encourage you to participate as well.