Coffee rave is the latest trend in cities like Mumbai, Delhi, Surat, Indore, Lucknow, Hyderabad and Nagpur, where cafes offer alcohol-free parties with DJs and espresso shots. Coffee shops are hosting "underground" events, which blend caffeine, community and club-level beats, News18 reported. Coffee raves started as underground gigs in European bakeries and cafes and later hit New York.