Restrict category pages?

Hello, I’m using the Events Calendar Pro here: http://www.littlefoxwebdesignnewbuilds.co.uk/ripleyrascals/events/ and you can also view the two Events categories here: http://www.littlefoxwebdesignnewbuilds.co.uk/ripleyrascals/events/category/lifesaving/ and here: http://www.littlefoxwebdesignnewbuilds.co.uk/ripleyrascals/events/category/competitive-swimming/. I need to password protect all three views of the calendar. I’ve installed the Restrict Content plugin but can’t work out how I can password protect those category pages? Any help greatly appreciated!

Many thanks.

Kathryn