SOT Annual Meeting Baltimore March 12-16, 2017. With the app, you have access to all the information from the Program, The Toxicologist, ToxExpo Directory. Every March, around 6,500 toxicologists and 350 exhibitors attend the SOT Annual Meeting and ToxExpo, the largest gathering of industry, governmental, and. To register to attend the SOT 56th Annual Meeting and ToxExpo, please follow the instructions below. Note: Undergraduate and high school students should.