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var pTags = $( "p" );
$( "button" ).click(function() {
  if ( pTags.parent().is( "div" ) ) {
    pTags.unwrap();
  } else {
    pTags.wrap( "<div></div>" );
  }
});

$(".EventList > .EventListItem:not(:first-child) a").contents().unwrap();
// use .contents() to unwrap the target element