You use get_query_var(‘post_type’) to set the post type in your args array
$args['post_type'] = get_query_var('post_type');
and also include the right loop part based on that for example:
if (get_query_var('post_type') == "event"){
get_template_part( 'loop', 'event' );
}else{
get_template_part( 'loop', 'other' );
}