Are incoming graduate students reported in questions 14-17 as incoming students if our institution requires graduates students to participate in prevention and education events?

Yes. If incoming graduate students are required to participate in the Minimum Requirements programming as defined by the school, then report them in q.14-17.  However, if your institution does not require graduate students to participate in prevention and education events, do not report them in q.14-17.  Remember, the key element in reporting students in the Minimum Requirements section is the education is mandatory.