Robinhood Markets, Inc. (NASDAQ:HOOD) stock has already surged 360% from its April lows, and a new catalyst could provide even more momentum to an already eye-popping rally.Robinhood placed a major bet on the fast-growing market for event contracts—and it is paying off. HOOD stock is rallying. See the real-time price action here. 4 Billion+ Event ContractsRobinhood CEO Vlad Tenev revealed on Monday that the platform has surpassed the $ 4 billion mark in event contract volume – a milestone that demonstrates ...