Bay seniors eager to celebrate the slaying of the demoness Holika by Lord Vishnu’s devotee Prahlad will have a number of opportunities this spring. Although this Hindu festival may include activities such as rattlesnake derbies it is best known for the volleys of hotly colored and harmlessly washable powders that participants throw at each other. You can join in at Bishop Ranch in San Ramon on March 14 from 5-7. In the city Holi is in full swing at James Lick Middle School on March 30 from 12-3. $20. Another big one is promised in town it’s place and time yet to be resolved at Geezer press time. It almost goes without saying that attire is something you don’t mind getting colorfully dirty.