An incoming thunderstorm was no deterrent for DJ Samir Neffati and his monthly electronic music set, which fuses dub beats and a downtempo rhythm, at Smiley’s Schooner Saloon last Thursday. Throughout the roomy barroom, a dozen patrons mingled or tapped along to the infectious bounce coordinated and programmed by Mr. Neffati on his computer and dual turntables. Since early 2016, Mr. Neffati, a tall, slender man with a neat, dreadlocked bun, has maintained a monthly…