How do I not be socially awkward?

I feel like I never know the right thing to say to people. I am going in to an event to meet a lot of new people in two days and I'm terrified.

I don't know when a joke is being told and I often miss laughing cues. I suck at making conversation and making jokes.

I often stumble on my words and I am not quick witted at all. I'm not even quick to respond to a regular conversation.

How can I stop being so awkward before this event?
How do I not be socially awkward?
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