As Watertown School officials seek to find the next Watertown High School principal, parents and students will have an opportunity to talk about what qualities they would like the person to have. Superintendent Dede Galdston told the School Committee Monday that, while the deadline to apply for the position closes Friday, the district has already has nearly 30 candidates. She said the next principal, who replaces the retiring Shirley Lundberg, will have a chance not only to build a learning environment at WHS, but a new school. The high school project has been accepted into the Massachusetts School Building Authority program, and planning for rebuilding or renovating the school has begun. The applicants for WHS principal will be screened by a committee made up of school officials, teachers, staff, parents and students.