Tempted to try "What are the two of us going to do tonight?" but I chickened out.
Eight months later I was sure it meant "What shall we do tonight," and I still think so!
I answered "what are you and I going to do tonight", but it was marked as incorrect ?!
I love this grammar. “What” is a verb - like saying “we’re going to what tonight?”
A year later, I still wonder how to say "What shall we do tonight?" in Hawaiian.