which festivals are celebrated in his honour?
Shivaratri, Kartik Purnima
Shiva
There is a "Shivaratri" in every lunar month on its 13th night/14th day, but once a year in late winter (February/March) and before the arrival of spring, marks "Maha Shivaratri" which means "the Great Night of Shiva".

Maha Shivaratri is a major Hindu festival, but one that is solemn and theologically marks a remembrance of "overcoming darkness and ignorance" in life and the world, and meditation about the polarities of existence, of Shiva and a devotion to humankind. It is observed by reciting Shiva-related poems, chanting prayers, remembering Shiva, fasting, doing Yoga and meditating on ethics and virtues such as self-restraint, honesty, noninjury to others, forgiveness, introspection, self-repentance and the discovery of Shiva. The ardent devotees keep awake all night. Others visit one of the Shiva temples or go on pilgrimage to Jyotirlingam shrines. Those who visit temples, offer milk, fruits, flowers, fresh leaves and sweets to the lingam. Some communities organize special dance 
what is the name of the hindu liberator god Vishnu who did he liberate? UNANSWERABLE from what? UNANSWERABLE by what other names is he known? Hari , Kala, Vasudev, Purusa, Atman and Prakrti who is shiva? One of the principal deities of Hinduism which traditions are associated with him? Smarta tradition in which forms does he appear? Nataraja, Nityanarta, Dakshinamurthy,Ardhanarishvara how is he depicted? Nataraja (Sanskrit: ', "Lord of Dance") why was he called the destroyer? Because he is one of the supreme beings who creates, protects and transforms the universe and who referred to him as their benefactor? Hindus. which are the types of iconographic forms of him? Nataraja, Nityanarta, Dakshinamurthy,Ardhanarishvara what is a lingam? According to Monier Williams and Yudit Greenberg, "linga" means 'mark, sign or emblem',Wendy Doniger, view "linga" merely as an erotic phallic symbol,Moriz Winternitz, the "linga" is "only a symbol of the productive and creative principle of nature. name the 5 mantras UNANSWERABLE how is he associated with yoga? He is the Lord of Yogis, and the teacher of Yoga to sages name a few of his avatars Durvasa , Adi Shankara
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Shiva [SEP] Festivals
There is a "Shivaratri" in every lunar month on its 13th night/14th day, but once a year in late winter (February/March) and before the arrival of spring, marks "Maha Shivaratri" which means "the Great Night of Shiva". Maha Shivaratri is a major Hindu festival, but one that is solemn and theologically marks a remembrance of "overcoming darkness and ignorance" in life and the world, and meditation about the polarities of existence, of Shiva and a devotion to humankind. It is observed by reciting Shiva-related poems, chanting prayers, remembering Shiva, fasting, doing Yoga and meditating on ethics and virtues such as self-restraint, honesty, noninjury to others, forgiveness, introspection, self-repentance and the discovery of Shiva.