Do you know the size of the joists and the spacing between them? Also how long do they span?
Again, I wouldnt be worried about 50 people. You may notice some slight flex where people are more highly concentrated, but that will be about it.
Modern houses are designed for a minimum of 50 pounds per square foot of live load - ie things that can move (over every square foot of the floor at the same time). If you do the math, it takes a lot of people in a room to "overload" the floor, almost more than can fit in the room. There is safety factor on top of that.
Old codes can't be too much different, or else they would have had problems even moving particularly heavy pieces of furniture across the floor.
If you have a cantilevered balcony, that's different. Don't put 48 people out on one of those.
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