I am in a similar (but obviously different) boat with respect to social anxiety.
Fortunately/unfortunately, work forces me into uncomfortable situations that force me out of that shell (temporarily)
I attend many conferences where I wander around, take notes, learn stuff etc, etc.
These conferences usually have Breakfast/lunch/dinner provided. I will start my day hiding in the corner of the breakfast area, hoping that no-one will sit at my table so I can eat and head to lectures. Later that day, I will present to a room of 200-300 people about something that's my area of expertise. Then, at dinner, folks will actively seek me out to sit with me at my table and discuss "stuff". Usually, that's when I need to go find a place to hide. I often skip the evening entertainment - both because my social battery is drained but also from the anxiety of knowing so many people now know who I am and will want to chat with me. (Alternatively, I get 3 or 4 drinks in me as a temporary fix - not ideal)
The funny thing is... when I get back to the office, my colleagues always think I'm lucky to go to these conferences at these nice places... Little do they know just how draining they are.
So, I empathize with you, but I don't have any words of wisdom for you. When your social battery is drained, exit stage right. When your social anxiety is high, choose fight or flight.
For someone with social anxiety, conferences, especially presenting in some sound like an absolute nightmare. The amount of masking needed to get through is surely very draining, good for you if you can manage it.
For myself as a night owl and a former restaurant worker it would be much easier to do the evening events and get to know people, it makes the next days daylight hour event more manageable.