The Dow closed down 35 points after swinging 300 points from an all-time high and Jim Cramer is digging into today's volatility. Next, RingCentral CEO Vlad Shmunis checks in after earnings to break down the numbers. Then, what stocks might be ready to heat up as summer approaches? Cramer's going Off The Charts to find the best ways to play the Memorial Day trade. Plus, Cramer's exclusive with Alteryx CEO Mark Anderson.