Is it ok for a group of girls in City A to try to find a group of guys in City A? Like say through a speed dating meetup? But it is wrong if the girls are from

Is it ok for a group of girls in City A to try to find a group of guys in City A? Like say through a speed dating meetup? But it is wrong if the girls are from City A and the guys are from City B? Especially when they claim City A has 2 girls for every guy, and City B has 3 guys for every 2 girls? What exactly is the issue?