calendar:
The links generally have a list of participating vendors and ticket info, for anyone interested.
Winter NAMM (January 24-27) Anaheim, California https://www.namm.org/thenammshow/2019
Synthplex (March 28-31) Burbank, California https://synthplex.com/index.php
Machina Bristronica (March 30) Bristol, UK http://machinabristronica.uk/
Musikmesse (April 2-5) Frankfurt, Germany https://musik.messefrankfurt.com/frankfurt/en.html
MEFF Modular Synth Fest (April 7-9) Florence, Italy http://tiptopaudio.com/meff/about-us/ *free for visitors
Superbooth (May 9-11) Berlin, Germany https://www.superbooth.com/en/landing.html
Summer NAMM (July 18-20) Nashville, Tennessee https://www.namm.org/exhibit/ss19
NAMM Musikmesse (September 12-14) Moscow, Russia https://www.namm.org/exhibit/russia
dates to be determined: Knobcon, Deli Stompbox Exhibit(s), Tokyo Festival of Modular, Melbourne Synth Festival, Dutch Modular fest, et cetera.