When was it women were allowed to go out drinking on their own and similar social outings?Im looking at feminism and how things have changed...

Obviously, this would have been very different for
different families and different places even within the United States.  However, the
usual answer for this is that this sort of change started in the 1920s.  Again -- this
is the sort of thing that is very hard to generalize because there are not statistics
about it and things vary widely, but that is the usual
story.

The usual story is that the advent of labor saving
devices, of lots of kinds of entertainment like movies, and of cars led to this change. 
It is said that these changes gave women the ability to go out and gave them places to
go.  As this happened, mores began to change and women were "allowed" to go out on their
own more.