(For a Reuters live blog on U.S., UK and European stock markets, click LIVE/ or type LIVE/ in a news window.) (Updates to market close) NEW YORK, Aug 24 (Reuters) - Wall Street ended higher in a late-summer, light volume rally on Tuesday as the FDA’s full approval of a COVID-19 vaccine on Monday and the absence of negative catalysts kept risk appetite alive ahead of the much-anticipated Jackson Hole Symposium. All three major U.S. stock indexes advanced higher, with the S&P 500 and the Nasdaq closing at all-time closing highs. The session marked the S&P 500’s 50th record high close so far this year, and only in 1964 and 1995 had the index reached that level by the end of August, as pointed out by Ryan Detrick, senior market strategist at LPL Financial in Charlotte, North Carolina. Tech and tech-adjacent megacaps were once again doing the heavy lifting, but economically sensitive cyclicals and smallcaps outperformed the broader market. “Investors are looking at the horizon at the big Jackson Hole meeting on the horizon,” Detrick added, referring to the Federal Reserve’s annual economic symposium on Friday. “But for now the feel-good from yesterday’s vaccine news is still in the air.” The Food and Drug Administration’s full approval of the Pfizer-BioNTech COVID-19 vaccine on Monday fueled optimism over economic recovery which spilled into Tuesday’s session. Travel and leisure sectors, associated with economic re-engagement, enjoyed a healthy rally. “We have energy, retail, travel, leisure, financials, and small caps all doing well today,” Detrick said. “And that’s a sign that the reopening is alive and well.” Recent economic indicators suggest the recovery from the most abrupt recession in U.S. history is headed in the right direction, but not to the extent that is likely to prompt the Fed to tighten its dovish monetary policy. Fed Chair Jerome Powell is due to meet with other world bank leaders when the Jackson Hole Symposium convenes later this week, and his remarks will be closely parsed for any clues regarding the Fed’s tapering of asset purchases and hiking key interest rates. The event will take place virtually and not in person due to the spread of COVID-19 in the county, which has reduced expectations that any major announcement will be made at the event. “The minutes last week caused near term indigestion for investors, suggesting that tapering could start later this year,” said Detrick. “But fact that the Fed is having a virtual (Jackson Hole) meeting tells you that they might be thinking maybe they need to keep supporting the economy.” Unofficially, the Dow Jones Industrial Average rose 32.19 points, or 0.09%, to 35,367.9, the S&P 500 gained 6.74 points, or 0.15%, to 4,486.27 and the Nasdaq Composite added 77.15 points, or 0.52%, to 15,019.80. Energy was the top gainer among the 11 major sectors in the S&P 500, boosted by the continued rally in crude prices . Best Buy Co Inc jumped after the electronics retailer beat analyst earnings expectations and raised its full year sales forecast. U.S.-listed shares of China-based e-commerce platform Pinduoduo Inc surged after reporting its first ever quarterly profit. JD.com gained in the wake of the Chinese online retailer’s remarks on Monday that it does not expect any business impact from a wave of regulations hitting the industry at home. Invesco Golden Dragon ETF jumped as well, as other shares of Chinese companies listed on U.S. exchanges bounced back. Cybersecurity firm Palo Alto Networks Inc advanced as brokerages raised their price targets following its full-year forecast beat. Reporting by Stephen Culp; Additional reporting by Devik Jain in Bengaluru Editing by Marguerita Choy Our Standards: The Thomson Reuters Trust Principles.