Also, "takes place" should be accepted for "acontece" here, and sounds better in this context than "happens" (to this native speaker at least)
I also think 'next' Friday is acceptable as this is understood as a synonym in normal English usage for 'this'.
When I hear "next Friday," I think of the Friday of next week and not the one that is coming up "this" week.
I agree. If at any time during the week, including Sunday, someone mentioned next Friday, I would assume that it was the Friday of the coming week.