Fifth Harmony, a girl group that got its start on “The X-Factor” and has been groomed by Simon Cowell, played for about 600 fans at the Square One Mall (at right) on Monday afternoon. The group will also be featured on the Disney Channel Friday night during the premiere of “Teen Beach Movie,” which stars Ross Lynch of “Austin & Ally” and Maia Mitchell of ABC Family’s “The Fosters.” And yes, if you don’t have tweens or teenagers, you can probably forget this whole paragraph.

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