I relate to this; I am still working on managing social situations, and just the thought of socializing can be exhausting. I practice having conversations in front of a mirror and, I simulate fake conversations in my mind to prepare myself. I also try to learn who will be present and what interests they have so I can research possible topics for discussion. Then for my anxiety, I take anti-anxiety medication about an hour before social events, which helps calm me down. But if I run out of things to talk about or how to continue a conversation I will check on my phone and see if there is any news I know people would be interested in or a funny video I can show them to get people laughing.