tatah-thereafter; midhvamsam-Lord Siva; amantrya-inviting; sunasirah-the demigods headed by King Indra; saha rsibhih-with all the great sages, headed by Bhrgu; bhuyah-again; tat-that; deva-yajanam-place where the demigods are worshiped; sa-midhvat-with Lord Siva; vedhasah-with Lord Brahma; yayuh-went.