Calling all Espresso fiends! One of Boston’s most highly-regarded coffee sellers, Counter Culture Coffee, will be hosting a class at their Somerville Training Center on everything espresso. You’ll learn how to master espresso by learning about the different variables that affect it. You’ll also get a chance to practice latte art so you can impress your friends when you make them coffee at home. The registration includes a subscription trial of Counter Culture coffee sent straight to your front door. Tickets: $150.