Hi Stephen, welcome to OM.
'Organised' is putting a bit much emphasis on it (we try...
), but if you keep an eye open for 'Meets and Partners' threads on here & sign up for any you fancy... Meets are set up by anyone who will stick their neck out and start a new thread (so you could too - make a suggestion and a date and see who wants to come along).
I'll hopefully be doing a couple of Peak District day walks on the weekend of 19th & 20th May with other OM folk, but threads won't go up until a few days before (when we've seen the weather forecast and planned appropriate routes).
Meets currently in the pipeline (that I'm aware of) are:-
Wildcamp with Twigs
Glen Coe
Dartmoor
North York Moors
There will be more set up as time rolls along. There's more camping (wild and sites) in summer and more barns and hostels in autumn and winter.
Hope this helps. Basic 'rules' are: everyone is welcome, take responsibility for your own safety, car shares are good, have fun