The next meeting of the Things Network Sheffield will be held on Monday the 3rd September at Arup, on the 9th floor of 3 St Paul's Place in Sheffield city centre, from 5-6pm.
This is right before the SmartSheffield meetup, and you can get tickets for either or both events here: https://events.ticketsforgood.co.uk/events/867-smartsheffield-11-city-scale-systems
The Things Network is a global initiative that empowers communities to build their own Internet of Things communication networks, based on the LoRaWAN standard.