How can I get Sponsorship for my startup

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Hello all, I have done a startup called If The Contest. We organize online events over there. After a successful quiz event we are to organize a Photography Contest. So for the Photography Contest I need sponsorship and we will advertise their brand along with our event. So how can I get sponsorship for the same. Please Answer. You can check www.facebook.com/ifthecontest page for the reference to my startup Thanks