The rally in U.S. stocks is wobbling as it confronts a stretch of potentially market-shaking events, starting next week with corporate results from tech titans and the closely watched employment report, while the U.S. election is also nearing. Still, equities remain at elevated valuations, which could make stocks vulnerable should any of the near-term market events fall short of expectations. “People will be on pins and needles for most of next week,” said Peter Tuz, president of Chase Investment Counsel Corp. “The market is expensive … Any time you have an elevated market the potential for a bigger downdraft exists if something disappointing happens.”