Ocean Media told Event that 11% will spend between £500,000 - £1 million, while 29% will pay out between £100,000 - £500,000.
Morgan Stanley, Network Rail, Met Police, AEG Live, RPM, Jack Morton, BBC Sport and L'Oreal UK are among buyers signed up to attend the two-day show.
The majority of registered attendees organise up to 10 events per year but 35% organise more than 30 events annually, according to Ocean Media.
The new event industry show will run alongside sister exhibition the Event Production Show, whose visitors last year had a collective buying power of half a billion pounds. Organisers expect 250 venues to exhibit in 2012.
said the challenge for venues in 2012 will be to "get the balance right between price and offering."
She added that after the Olympics their focus should be to "work closely with new and existing clients to get them through the new year".
"The show is designed to be the business platform to meet all those important contacts. The tight focus of the event will give exhibitors the first opportunity in the exhibition industry calendar to meet key decision makers, which will give the venues the first stab at securing business for the year ahead," she said
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