Each month has a tab, so you can quickly flip to it, and you can also check out the monthly calendar view. (businessinsider.com)
The only time I saw any lag was in switching among calendar views from day to week to month, and that was no more than a second or two. (lawsitesblog.com)
The event / holiday will be displayed in the upper right corner of the daily calendar view. (windowscentral.com)