I do have the same issue. Yet still I really like the simplicity of GigPress. It would be perfect if it only had a more responsive frontend design.
I already made some adjustments via css, like hiding the calendar add button or the upper border. But this is not enough for the majority of people using smartphones, as @trcrowe already pointed out
I really do like this event list –> https://rikasband.de/#events
Hopefully this is a little bit of inspiration for you and your plugin development.
Best regards,
phil