Hi Jeff,
I used the basic PRS (not the APRS) by entering %,Alvington,1884/5/6 and marriage.By looking at these few records you find that Rev Pengelly was in office there from early 1884 to late 1886. You can do the same type of search for baptisms and burials - all rather slow! You could use the same process in the Advanced Search I believe.

Regards

Peter