Experience a spectacle under the sea and a sock hop of lightnin&amp;#8217; proportions this summer at the Tuacahn Amphitheatre. Tuacahn Amphitheatre, just west of St. George, is presenting the regional premiere of Disney&amp;#8217;s &amp;#8220;The Little Mermaid&amp;#8221; along with acclaimed musical &amp;#8220;Grease&amp;#8221; throughout the summer. &amp;#8220;The Little Mermaid&amp;#8221; shows each Monday, Wednesday and Friday through Oct. [...]