/**
* Conditional function to check if post belongs to term in a custom taxonomy.
*
* @param    tax        string                taxonomy to which the term belons
* @param    term    int|string|array    attributes of shortcode
* @param    _post    int                    post id to be checked
* @return             BOOL                True if term is matched, false otherwise
*/
function pa_in_taxonomy($tax, $term, $_post = NULL) {
	// if neither tax nor term are specified, return false
	if ( !$tax || !$term ) { return FALSE; }
	// if post parameter is given, get it, otherwise use $GLOBALS to get post
	if ( $_post ) {
		$_post = get_post( $_post );
	} else {
		$_post =& $GLOBALS['post'];
	}
	// if no post return false
	if ( !$_post ) { return FALSE; }
	// check whether post matches term belongin to tax
	$return = is_object_in_term( $_post->ID, $tax, $term );
	// if error returned, then return false
	if ( is_wp_error( $return ) ) { return FALSE; }
	return $return;
}

// get tribe categories in an array if you need them all (optional)
			$terms = get_terms("tribe_events_cat");
			$count = count($terms);
			$tribe_cats_me = array();
			if ( $count > 0 ){
				foreach ( $terms as $term ) {
					$tribe_cats_me[] =  $term->slug;
				}
			}
			
// check if this post has a category (the second argument) ; here I've used an array of categories			
if (pa_in_taxonomy('tribe_events_cat', $tribe_cats_me )) {
	// do true stuff here
}