The Society of Petroleum Engineers (SPE) was officially founded in 1957 but its roots date back to the 19th century. SPE annually organizes more than 100 events around the world devoted to technical information exchange in the upstream oil and gas industry.
It was a petroleum industry exhibition but the advert didn't specify that. It just said international trade exhibition. I and two other persons were disappointed that the exhibition was just meant for people in the petroleum or oil sector & we couldn't participate, talk less of getting in. Such a waste of time!