I don't know why these nightclubs are going to accept BCH while BTC is the best cryptocurrency and I think BTC is the most popular cryptocurrency in Japan cause Japan is the hometown of BTC. Maybe these nightclubs wanna make something different cause there are so many other place in Japan accept BTC for payment so they wanna find another cryptocurrency to do the same thing 
)
)Perhaps they want to popularize bch because of the fud around it. They maybe want to cause a pump either to make room for a dump or actually trying to boost the growth of the coin.