[musha68k]

I've been there, same as in Quebec for French but I would see it as a learning opportunity to practice.

In Austria I've always made an effort to stay inclusively in English in these settings but it's probably normal to fall back to default language in most countries and cultures especially when the context is not about the work per se.

[mstaoru]

Isn't it a bit of a chicken and egg problem? You cannot join a fluent conversation without being fluent. You cannot become fluent without practicing.

[musha68k]

You need to listen / interject and show that you are making an effort, then people usually will meet you there and you can even fall back to English again if you have to but then steer back towards target language. Learning opportunities.