In San Francisco this April, there are all sorts of openings to share with you. Here are 10 favorites that are open and shut cases for fun: 

Opening Day San Francisco Giants 
“Play ball!” Those two magical words signal the return of America’s national pastime. And it’s no wonder that Major League Baseball is advocating that Opening Day be declared a national holiday. At press time more than 102,000 fans had signed an online petition to make it official. On April 8 San Francisco Giants fans are encouraged to be in their seats at 12:50 p.m. to catch opening day ceremonies. The National Anthem will be sung by Capital Cities, the duo behind the hit song “Safe and Sound,” before Tim Hudson takes the mound at 1:35 against the Arizona Diamondbacks. 

Opening Day on the Bay 
Sunday, April 27, 2014 is Opening Day on the Bay. This time-honored tradition features a parade of more than 100 historic workboats, fireboats, tow boats, classic and contemporary craft decorated to interpret the theme, “Visions.” There will be both power and sail boats competing for best decoration honors. The “California Hornblower” as well as other boat companies will be offering special opening day cruises. 

San Francisco International Film Festival Opening Film 
The opening (and closing) films have been announced for the 57th San Francisco International Film Festival (SFIFF), April 24-May 8, 2014. SFIFF kicks off with the opening night presentation of Hossein Amini's gripping Patricia Highsmith adaptation “The Two Faces of January” starring Oscar Issac, Viggo Mortensen and Kirsten Dunst. The festival will come to a stirring conclusion with Chris Messina's drama “Alex of Venice,” starring Mary Elizabeth Winstead, Messina and Don Johnson. Special guests are expected to attend and will participate in post-screening Q&As at each event, and both screenings will be followed by high-energy celebrations. 

Another Opening of Another Show 
Among the shows to open in April are “Painting the Clouds with Sunshine,” April 2-20, 2014; “Tribes,” April 11-May 11, 2014; “The Suit,” April 23-May 18, 2014, and “Seminar,” April 29-June 14, 2014. A world premiere by 42nd Street Moon, “Painting the Clouds with Sunshine” includes beloved songs from the 1930s; in this musical, the Great Depression is viewed through the prism of the “talkies.” “Tribes” at the Berkeley Rep is directed by Jonathan Moscone and speaks volumes, even for sibling Billy, who is deaf, about the dynamics of family life. Described as “exhilarating,” the internationally acclaimed musical, “The Suit” is based on a short story by South African author Can Themba. Presented by American Conservatory Theater, it is a tragic tale of betrayal symbolized by the suit left by a fleeing lover. Four aspiring novelists paying for a 10-week private writing class provide a feast of funny wordplay in the San Francisco Playhouse production of “Seminar.” 

Open Wide! 
The carnivores are returning to the Conservatory of Flowers in Golden Gate Park, April 11-Oct. 19, 2014. The special exhibits gallery will be transformed into a swampland populated with hundreds of meat-eating plants for “CHOMP! They Came from the Swamp.” These weird and wonderful plants will be accessible to visitors who want to get up close and personal. And be sure to check the schedule for “feeding” times and plant dissections. Large models of several species throughout the exhibit also offer guests a taste of what it might be like to be a tiny insect in a world of towering meat eaters waiting for their next meal. 

Open Space 
Opening ceremonies were held a few days ago for the debut of Kezar Triangle, located between Kezar Drive, Arguello Boulevard, and Lincoln Way in Golden Gate Park. The 2.8-acre, multipurpose grass meadow combines art, ecology and community engagement. Temporary art projects include “The Plot to Grow Art,” a small, fenced area dedicated to growing ideas that connect people through temporary plantings and architecture.