Are you at university? Because if you are, you should point out to your mother that when you're away from home, you can do whatever you like and there's nothing she can do to stop you. So stopping you from going to this one party is not going to do any good at all. It won't stop you from doing any of the things she's afraid of, because you can do them during term time, and are more likely to if she restricts you during the holidays, and it will make you feel resentful towards her for stopping you from seeing your friends.
Explain to her that you are an adult now, and that you have chosen to follow your religion, and are not planning to get drunk or do any of the things she is afraid of. But you are old enough now to look after yourself, and you'd like her to recognise that and trust you enough to make your own decisions. She can't baby you forever, and if she tries, she will only make things difficult.