I say Keflavik at 2024-12-05T21:00:00Z since there is a Keflavik fly in at that time. After i say it’s best to do Copenhagen since it’s the most popular airport out of all. It’s your choice and you can control what ever part suit’s you the most. I will mark you on the IFATC Schedule and which position are you planning? GND, TWR DEP ect.?