The Royall House & Slave Quarters reopens today for its 2023 tour season. The museum will offer guided tours at 1, 2 and 3 p.m. each Saturday and Sunday through October 15. No reservations are required. Admission for guided tours of the mansion is $10 for adults; $8 for seniors; $5 for students; $2 for EBT or WIC cardholders; and free for children age 12 and under, Tufts University students, Blue Star Families, and Massachusetts Teachers Association members or retirees.…