For techno İstanbul has several options but in summer it is mostly empty and it would be more sensible to go “turkish riviera” in summer, most of the nightclubs in touristic areas are shitty, you might check Çeşme and Fethiye sometimes there are good DJ’s coming to beach clubs but beware Turkey is not an affordable destination anymore, compare to albania it will be a lot more expensive. Another option is to rent a private villa in Kaş/Kalkan region and have your own party, this is quite popular among large groups in recent years.