Using post_where filter only on main query NOT sidebard new WP_Query

The second parameter here would be useful in targeting the appropriate context. 

add_filter( 'posts_where', 'Where_Events', 10, 2  );
function Where_Events( $where, $wp_query ) { }

The global $wp_query would be able to tell you whether the query was for the main query by checking $wp_query->is_main_query().

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