You could try to see this data in the dashboard widgets, but HiveManager Classic doesn't store data for very long, and the APs store data for even less, just to prevent their memory from filling up. If you set up reports ahead of time, you would be able to see unique clients and their usage, but that isn't something we can capture retroactively. Your best bet for this kind of issue is a packet capture run while the spike is happening. This guide goes over how to set up and run a packet capture- https://thehivecommunity.aerohive.com/s/article/Packet-Capture
