The Boston bombings have UC Davis Police stepping up security ahead of this weekend's "Picnic Day" celebration. Officers say they will be closely watching campus access points and even calling in backup from other state universities. The event, which usually attracts more than 50,000 people, is billed as a family-friendly open house but some students use it as an opportunity to drink. This year's Picnic Day also falls on April 20th, which traditionally a holiday of sorts for marijuana users. A city of Davis ordinance imposes a $400 fine for open alcohol bottles, urinating in public or being too loud.