steam machines...steam engines...steam vehicles
each of those cover a wide range of things.
you'll need to be a bit more specific.
if its Rail, you already live in the number one steam rail loving place in the world!
yes, there is a massive "steam" society in southern ontario.
farm and rail
a number of related museums and groups.
many centered around Port Dover area.
on the web, there are countless numbers of groups.
I am a member of this forum...they were helpful when I was designing my Autocar Armoured Car model.
https://www.smokstak.com/
probably none of this helps you since you are in the UK. sorry
In the Uk, stationary engines are a massive collectors thing.
I have a relative who collects them.
Has dozens...many are steam powered.
He regularly goes to Meets, but I'm not aware he is in any sort of club or society.
Maybe a local Meet could help you find what you are looking for?