When there's money to be made through simple reptition of events, human greed will set in. 

Previous Bitcoin halving resulted in profits. When more and more people know, they will try to profit more from the event. 

How so? Buy earlier than the rest and sell on event. That's what happened to Bitcoin related stocks post etf approval. 

Likely the same thing will happen for halving event. Unlike stock market, whereby there are mixture of investors and speculators. Crypto field is filled with speculators who are out for quick buck. Selling the event will become a very probable scenario. 

Well, as there are so many speculators within the crypto field, the situation will never be rational and expect volatility no matter what