For Fun Matches you need to contact your local all breed dog clubs and you breed clubs in your area. They are the one's that sponcer them. You can do a search to find them, they usually pop up.
For dog shows - AKC ones, contact
www.akc.org and click events and shows and then look for your area. You can sign up on line or order an entry form. Just make sure you have time if you roder via mail since there our deadlines to enter. You can enter in AKC shows from 6 months up.
I do not know about UKC.
Best of luck to you.
T.