School is back in session for Cal Poly students and for many businesses in the area, theyre already seeing a boost in sales. Residents are also preparing for an influx of students.Cal Poly students are facing their first fall semester this month and before classes start for the 2026 school year, students and their parents were making an impact on local businesses in Downtown San Luis Obispo.Peter Shaker owns SLO Froyo n' Italian Ice, SLOyo and S…