this will take some time to do but allow me to do a quick start:
IMEX, Frankfurt / 20.000 pax / May
The Meetings Shows, London / 5000 / June
IMEX America, Las Vegas / 20.000 pax/ October
IBTM Barcelona / 15.000 / November
Many national shows aswel.
ALL THESE TRADE-SHOWS: stands are mainly venue’s and destinations 1,5% is technology / lots of free education / free entrance.
Awards, several awards events like BEAWORLD
ASSOCIATIONS and their conferences.
MPI (Meeting Professionals International) / AMERICAN, Dalas / 25000 members / chapters i all US states, and in many European cities/ did a european conference (now with SITE) and does WEC the big conference 2000 pax in July.
PCMA (Professional Conference Managers Association) / American, Chicago / 14000 members / mainly in USA, moving into EU / a few conferences: Big one is Convening leaders 2000 pax /
SITE 'Socity of Incentive travel executives) now does EU conference with MPI.
ICCA (International Conference and Congress Association) / Amsterdam /
My own event:
MDI Meeting Design Institute / Member based organization around Meeting Design
The FRESH Conference: 300 pax fully focused on Meeting Design. 2018 theme is Interaction 2 day Multi Hub conference happens in 4-5 cities in europ/ On of the scientist at Gothenburg SMS is confirmed as a speaker.
many other smaller & national associations and events… eg Event Tech London November…
(CIC now called) EIC Events Industry Council is the Federation of associations in the industry.
Hope this is good a start.
all the best.