The only one I have ever had any connection with is Marden and district .... they have regular events on their own ground every month except in winter.
I know some people that go and they seem to enjoy them.
I love hilltop at ledbury although my youngster hasn't been xc schooled yet and shes recently pulled a tendon which wasn't helpful, had it scanned yesterday 4-6 weeks of rest :-( I absolutely love XC think she may be more of a SJ though.
Hereford and Distric riding club holds lots of events and training sessions if thats the kind of thing you are looking for. They are probly more your way as well. There is also Vale of Arrow but thats more towards Wales area, they do a bit but not as much as Hereford one, theres lots of others around. Take a look at http://www.herefordequestrian.co.uk/ they have a list of the riding clubs in the A-Z section, under R for riding or C for club.