I suggest you chat up random people next time who do things you take an interest in. You'd be surprised at how many people just come to chat. No one minds.
Actually I did and also met a bunch of nice people. But then again you can do that only for so long.
I would not describe me as being particularly shy, but I was not able to find a place to anchor and the amount of talks etc. was not accessible to me being on my own, reading through heaps of abstracts on the app.
I just could not get into a healthy rhythm with the congress - sad as it may sound.