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While it's possible that the information you required could be produced from capture files generated somewhere in your network, Wireshark really ins't the tool for this task, it's a Packet Analyser used for inspecting traffic in excruciating detail.

You might get better results using some form of network monitoring tool, although you'll need to define what you mean by "record users who join a network" to allow others to guide you to more suitable tools. How do users join your network?