The first major master plan in two decades for the University of Tennessee Health Science Center aims to start a conversation well beyond the borders of the Memphis Medical Center-area campus. With its new five-year plan for adding 15 new facilities and renovating 10 more on the campus, the university also is inviting its neighbors, developers, retailers, restaurant owners, bioscience firms and others to join in. “What we would hope is that people look at this and want to participate in the crafting of the Medical District,” said university Executive Vice Chancellor and Chief Operations Officer Kennard Brown. Capping a year of work, consultants with the global architectural and design firm Perkins + Will will present the plan at an open house Monday from 5 to 7 p.m. in a dining hall at the Student Alumni Center.