Hide events marked as “free”

My wife and I use a shared calendar in addition to our own personal calendars. Sometimes, there are events on the shared calendar that I need to schedule around. My wife and I have a convention of marking these tasks as busy. But, other tasks are more informational, and do not really impact my scheduling, And my wife and I mark these as free on the calendar. Free and busy are built in calendar attributes, and it would be really useful to have the option to hide any events marked as free.