Murat Yüksel replied the topic: Ausländerbehörde KVR1- Is there any chance to go there without appointment?
In the morning you might find available for that day or next day but really low chance. I saw it once and that time my papers was not ready I found mine for November, by chance updated today for October. Also at night near 00.30 you can get appointment for 100 days later. As far as I know for blue card you can't go without appointment but I heard if it is urgent, visa is expiring for example, you can call and explaining the urgency get an appointment.