Passage: In March 2017, the Olympic Council of Asia initially announced that the Games would feature 484 events in 42 sports, including the 28 permanent Olympic sports contested at the 2016 Summer Olympics, the five additional sports that will be contested at the 2020 Summer Olympics in Tokyo, as well as events in other non-Olympic sports. In April 2017, the OCA approved reductions in the programme in response to cost concerns; belt wrestling, cricket, kurash, skateboarding, sambo, and surfing were dropped from the programme, and there was to be a reduced number of competitions in bridge, jet ski, jujitsu, paragliding, sport climbing, taekwondo (in particular, all non-Olympic weight classes), and wushu. These changes reduced the total number of events to 431.The final programme was unveiled in September 2017, increasing it to 465 events in 40 disciplines as the second-largest programme in Asian Games history. Additional disciplines being introduced at the 2020 Summer Olympics were also added, including 3x3 basketball and BMX freestyle.For the first time in Asian Games history, eSports and canoe polo were contested as demonstration sports in the Games. Six video game titles, most notably Pro Evolution Soccer 2018, were featured in the eSports events.

Question: Why did the number of the events fall to 431?
changes