Can a bubble form in stocks again?

While we maybe thinking far in advance, if the markets don't turn by september 7th or so, we have an intermediate high turn date on november - meaning markets could rally all the way into that turn date, it could be a rise similar to the one in the shanghai index. So we give the market some time to turn down by mid september, we would have an inversion in my cycle model and then higher prices into our november turn.

Fundamentally, considering the FED's liquidity pumping scheme a bubble is not far fetched.