The “NoCase Showcase” runs Thursday, Mar. 21 at the Seahorse Tavern. All ticket proceeds support Mobile Outreach Street Health. Owen Harris and his bandmates knew they wanted to do something when they saw the HRM had cleared out and fenced off the Grand Parade tent encampment. Raised in Halifax, the Customer Service drummer had watched the city’s housing crisis turn “very severe” in recent years as the province grew and struggled to keep pace with living costs…