Have I correctly used 'at the end of,' 'consisting of,' and 'including' in the given sentence?

Have I correctly used 'at the end of,' 'consisting of,' and 'including' in the given sentence? Please help me.

At the end of the mass officiated by Rev. Fr. Fred Sullivan, a tribute was given to the alumni of Kelly's school who were 80 years old and above, consisting of tertiary, secondary, and elementary graduates, including priests and other religious people.

Context: The alumni honored, who were 80 years of age and above, finished college, high school, and grade school studies at Kelly's school. This implies that some did NOT complete college or high school in that school (but perhaps in other schools). Among those alumni were priests and other religious people.