Saturday 19th January 2019 the 54th edition of the MSXRU event will be held in Barcelona at Centre Jove la Fontana, Spain. As they explained, this time the usual dates for the second users meeting of the year (usually on December) had to be postponed to next year because the room was already booked even four months earlier. For now booth reservations are not open. The organizers will inform as soon as possible about any news.
Relevant link: 54th Barcelona MSX users meeting