Until recently, many of us have been doing almost everything from home with no immediate hopes of in-person outings. But, this summer — as entire countries reopen — people who’ve been stuck inside are finally breathing a sigh of relief. At the same time, some company leaders are doing the opposite. Why? In past years, entire industries have seen summer slumps — or seasonal dips in sales or web traffic. This year, business leaders are expecting sharper dips as more consumers travel or unplug. They’re also dealing with frequent HR requests from employees who’ve been waiting months to take vacations….