CATSJ normally has regular meetings (CATSJ Meeting) twice a year, in spring and fall. The meetings have been held more than 120 times in many cities in Japan so far, and are consists of three categories, oral-A, oral-B and poster-A, as well as plenary and invited lectures. Remarkably, the oral-B session is highlighted because we have a longer presentation time (10 min talk+ 15 min Q&A), which is enough for in-depth discussion. In the fall meeting, the research divisions offer more than ten symposia on selected topics, while special symposia are organized occasionally.