Currently, the only way to view the weekend on a calendar is for every single user to go, open the specific calendar, select Calendar Actions, and display the weekend.
Being able to set a specific calendar by default to view the weekends would be very helpful.
To make this more of an issue, since there is no easy link directly to a calendar, we are using a dashboard (which has a direct link) to display them, and the Calendar Actions option isn't available from this view.