The results, announced at the IVCA AGM, showed 94% of Eventia members were in support of the merger, while 93% of IVCA members also voted for the creation of a new association.
Simon Hughes, chairman of Eventia, said the merger is in response to concerns raised by event industry leaders about the fragmented nature of the sector.
"This is the conclusion of a long journey for Eventia, which started when Mark Saxby was in my post and Izania Downie was still our chief executive," he said.
"This positive endorsement of a merger with the IVCA puts us in a much stronger position as an integral part of the creative communications sector. I'm delighted that our members have supported this, as it demonstrates once again their appetite for progress and willingness to embrace the challenge of change."
Marco Forgione, chief executive of the IVCA, added: "This is a really exciting moment for both associations and both our management teams are really looking forward to blending our talents to further improve the range and quality of the services we offer our members."
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