Crores of animals are killed during some feasts. Why are the poor innocent animals forcibly killed everyday for no mistake of them. Why the animals are suffering in the hands of humans? When will this stop?

Ahimsa is the foremost Dharma There is no doubt about it.
You are talking about animals suffering in the hands of humans. But we barely realize that all of us are suffering in the hands of Karma (fate). In order to get answers to the question of ‘what for’ and ‘why’, you should try and understand God. That is the only way. Until then, whatever I say would only be a consolation.