I'm very new to mma(trained for about a year in grappling/submission work,and have boxed and kickboxed as an amateur)

My question is how do i go about competing at a beginner level in either grapple subs or strike and submission.Are there any open mat shows etc? any help would be much appreciated,as i cant find anything i need on any forums.

Im in lincolnshire by the way,but will travel.Just dont want to enter something i have no right to be in!