Markets Brace for Turbulent September

US equity futures are flat, with cash markets of course closed for Labor Day holiday, stabilizing after Friday's selloff in tech stocks amid renewed Nvidia jitters, and setting a steadier tone at the start of a month that could bring plenty of tests to markets trading near record highs. S&P futures were unchanged with Nasdaq futures rising 0.1% to start a traditionally brutal month for markets.  The stock rally to all-time highs faces a crucial stretch, with jobs numbers, inflation data and the Fed’s rate call all landing within…