Suggest Treatments For Hair Growth

Ok.So i want to grow out my hair and my hair is a little bit longer than my shoulders.I want my hair to be almost down to my belly button in a year.Many people say Why dont you just get extensions But i just tell them that i dont want 2.I want to know if you could help me grow out my hair in about a year or so, because i have this event really important coming up!Can you please help me.