From July 1 to 3, St. Petersburg scientific life was particularly full. It was caused by the holding of the major international conference, which was conducted under the initiative of the SPbU and ISEI was devoted to the problems of early intervention and mental health of children. The organization and execution of this large-scale and considerable event of the world scientific community was provided by our company. We were responsible for the registration of participants (500 people from 40 countries), technical equipment, technical maintenance, multimedia, audio and other facilities throughout the entire conference. We were also in charge of data protection, organization of the poster session, provision of simultaneous interpreting, and coffee breaks.