While such events on the horizon can not be seen, the upcoming hardcore does not attract such an event.
Significant drawdowns are possible and will be, but not global level.
Its hardfork not hardcore, network might split into two which will give free forked coin to all bitcoin holder at a time of split. So people will buy bitcoin to get those free coin before dumping it hard after the fork.
the loud fork that occurred in August concluded that if when bitcoin breaks up and adds new conin, bitcoin holders will get new coins for free in accordance with the number of coins they have in bitcoin, and be sure that the occurrence if repeated will have the same effect ,