kalenda y'okusimba enva endiirwa mu zambia ye ndagiriro eri abalimi b'enva endiirwa mu zambia ng'ewa amawulire ku biseera ebisinga obulungi okusimba n'okukungula ebirime by'enva endiirwa eby'enjawulo mu bitundu by'eggwanga eby'enjawulo