Average participants ~100-150 as there are rules for invitations.
Participants are from Latvia, Estonia, Lithunia (suppliers) and invited guests from all around the world (buyers).
Event is held from 2010.
RSForms for participants and users registration in system and participants lists
Modified Appointmentbookingpro for meeting/calendar system.
System is working with registered users, so only after approval they can read lists, make an appointments, etc.