Hi sweety...search on the internet for your local bulldog club. There will be one somewhere close to you. You can get in touch with the secretary of the group and he/she will be able to tell you what they have going on.
Local dog training clubs will also have a list of events in your area, but these are likely to be all dogs. The main Dog Shows always have a bully group and you are allowed to take your dogs even if you are not enetering them x
Here in Manchester there are Builly Walks oh and I'm sure there is a national Bully Day held annually I missed this years though x