I think there are some good suggestions offered already, and with regard to monthly meets, perhaps you could look for some more that run on a different week as Urmstongran suggests then you might end up with one a week or so to go to? Also, if you google futurelearn, there are lots of free short courses to suit all interests that you can do at your own pace. Are you interested in bird watching? The RSPB have a lot of sights to visit, and if you become a member then entry becomes free and you can visit as often as you wish - there should also be an RSPB group you could join local to you, if you are interested. There's also English Heritage and the National Trust to consider?
Is there a local coffee group/natter group you could pop along to - these are welcoming places and often organise trips out, too. Perhaps there's a local book club you could join if you enjoy reading? Your local library should have information.
A search online might also show you if there are any nearby yoga/Pilates/exercise/swimming classes that you could join if something like that interests you.
Also, I agree with the poster who suggests you visit those friends who are in homes - I'm sure they will love your company.
Good luck and I hope something comes along soon for you.