Amazon.com Inc. said Wednesday that it will host its first Amazon Accelerate virtual event, a free conference focused on current small-business partners taking place September 1 through September 3. The conference will include more than 60 sessions and is meant to help these small businesses manage the rest of 2020 and beyond. U.S. small businesses have sold more than 3.4 billion products in Amazon stores over the last 12 months. Amazon stock has gained 66.7% over the year to date while the S&P 500 index is up 3.2% for the period.Market Pulse Stories are Rapid-fire, short news bursts on stocks and markets as they move. Visit MarketWatch.com for more information on this news.