Is it possible to store events (button press) with a puck that are retrievable later when a bluetooth device is connected?
Yes, absolutely. You might find this helpful: http://www.espruino.com/Data+Collection
It shows you how to store data and also how to connect and get it back using a Web Bluetooth webpage.
But basically you can store to RAM which is easy and will likely work well enough for you, or you can write to Flash memory so the data persists even after power off.
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