For a big-picture approach to this question, see Determining what records are available in a particular locale?
This is a general procedure for finding Staffordshire records. New record collections come online all the time, so even if these suggestions yield no results today, they may yield an answer tomorrow, next week, next month, or next year. Step zero ...
This is indeed (church) latin. The days are, referring to your list:
Festo Pascha, "Easter festival" -> Easter Sunday
Dom. Quasim. -> White Sunday
Dom. Miseric. -> 2nd Sunday after Easter
As for the numerals, I'm not sure. My guess is that this is the service the proclamation was made in (with several services on each day).