Nebraska Gov. Jim Pillen has accepted an invitation to be the guest speaker at the Boone Central High School TeamMates Banquet on Sunday, April 21.The banquet is set for 6 p.m. that day at the Cardinal Inn Event Center.Banquet attendance is by invitation, and RSVPs are due by April 11.The TeamMates Banquet provides an opportunity to honor mentees and mentors, and to review the history of the…