If theme has view, use it. Else, use the one included with the plugin.

plugin-template-theme-override.php

public function event_template_redirect() {
	global $post, $wp;
	$plugindir = dirname( __FILE__ );

	$return_template = '';

	if ( is_tax( 'iso_season' ) ) {
		$templatefilename = 'archive-events.php';
		if ( file_exists( TEMPLATEPATH . '/' . $templatefilename ) ) {
			$return_template = TEMPLATEPATH . '/' . $templatefilename;
		} else {
			$return_template = $plugindir . '/templates/' . $templatefilename;
		}
	} else if ( get_post_type() == 'iso_event' && is_single() ) {

		$templatefilename = 'single-event.php';
		if ( file_exists( TEMPLATEPATH . '/' . $templatefilename ) ) {
			$return_template = TEMPLATEPATH . '/' . $templatefilename;
		} else {
			$return_template = $plugindir . '/templates/' . $templatefilename;
		}
	}

	if ( $return_template != '' ) {
		$this->do_theme_redirect( $return_template );
	}
}

public function do_theme_redirect( $url ) {
	global $wp, $post, $wp_query;
	if ( have_posts() ) {
		include( $url );
		die();
	} else {
		$wp_query->is_404 = true;
	}
}