Meghan Markle and Prince Harry were spotted enjoying a date night at Soho House Austin before the Duchess of Sussex’s South by Southwest appearance in mid-March. The American-based royals often frequent the exclusive members-only club, especially since they had their first date at the London location. A source revealed the Sussexes seemed “happy and in great spirits.” “Harry was very animated throughout the dinner,” the bystander told an outlet. “They were super low-key and seemed happy to be around the upbeat vibes at the lively venue.” In his memoir, Spare, the Duke of Sussex reflected on hi…