International Fair Plovdiv International Fair Plovdiv International Fair Plovdiv (), held in Plovdiv, is Bulgaria's largest and oldest international trade fair. It was established in August 1892 as an industrial and agricultural show. During its first year, the Plovdiv Fair had an exhibition area of 90,000 m², participants from 24 countries and 162,000 visitors during its two and a half months. A National Industrial Exhibition was organized in 1933 that had 424 exhibitors and 120,000 visitors, being the first sample fair in Plovdiv. A second followed in 1934, when the Plovdiv Fair was proclaimed permanent and the only in Bulgaria on 16 May.
Plovdiv is the second or the third-largest cosmopolitan city inhabited by Bulgarians, after Sofia and possibly Varna. According to the 2001 census, out of a population of 338,224 inhabitants, the Bulgarians numbered 302,858 (90%). Stolipinovo in Plovdiv is the largest Roma neighbourhood in the Balkans, having a population of around 20,000 alone; further Roma ghettos are Hadji Hassan Mahala and Sheker Mahala. Therefore, the census number is a deflation of the number of Roma people, and they are most likely the second-largest group after the Bulgarians, most of all because the Muslim Roma in Plovdiv claim to be of Turkish ethnicity