The San Antonio Spurs are celebrating the opening of Frost Plaza — the outdoor gathering space at the team’s new Northwest San Antonio training facility — with a fan fest and official watch party this Sunday. The event will kick off at 3 p.m. with a ribbon cutting including Frost Bank and Spurs leaders, followed by a 3:30 p.m. basketball skills clinic featuring student athletes from two local middle schools. The pre-game festivities will begin at 4 p.m. with free Spurs-themed pan dulce for the first 500 attendees.