Oh, yeah. We have your weekend planned. All in one place. Easy. Spend tonight, Saturday and Sunday at Harvard Square’s 3rd Annual Chocolate Festival. No brainer, right? Imbibe chocolate cocktails at Grafton Street, savor chocolatey desserts at Harvest and Henrietta’s Table, and check out other specials going on around town. On Saturday, indulge your chocoholic tendencies with free samples of chocolate at 27 Brattle St (1-2 PM). On Saturday and Sunday Upstairs on the Square will be holding a Chocolate Lover’s Tea (2-4 PM; $32 for adults; $16 for kids; 617-864-1933).