Be mentally prepared to face social events and parties. Focus on the positive side, meet new people.
Knowing when and how you’ll leave a party gives you control over the situation.
Pass your time with small talk with people.
One of the best way for introverts is to find a quit place to sit and chill.
Try to stay sober to enjoy on your own.
Participating in fun games and activities will help you to distract your mind.
It's okay to say no for anything and be clear about it.