Can you tribute summon for herald of perfection. The card only says it can be summoned by dawn of the herald. it doesnt say anything about normal summon or set. thanks?

Herald of Perfection is a Ritual Monster. Ritual Monsters can never be normal summoned or Set. Herald of Perfection in fact clearly states it can 'only be Ritual Summoned', so that alone means no Normal Summoning, and no Special Summoning initially by other effects like 'A Hero Emerges'.