The Sisters of Perpetual Indulgence will be celebrating their 30th anniversary with two big events this weekend.

Tomorrow night (Good Friday), there will be an opening party at Yerba Buena Center for the Arts for the "Under a Full Moon: 30 Years of Perpetual Indulgence" installation, in which the sisters will share their vast archives with the public. "The Sisters have been creating rituals, blessings, art, literature, and general debauchery designed to promulgate universal joy and expiate stigmatic guilt for the past 30 years." The event is free (donations welcome) and goes from 8 to 11:30 p.m. An RSVP is required (you have until Midnight tonight, do it quick!). The exhibit runs through June 28.

There is also currently an exhibit at the SF Public Main Library's James C. Hormel Gay & Lesbian Center displaying the Sisters' artifacts, records, press releases, photographs, habits, and other objects, which runs through May 7.

On Sunday, the Sisters will host an extra-Indulgent Easter at Dolores Park. In addition to their regular Easter activities, which are Children's Easter (11 a.m. to Noon), the Bonnet Contest (1 p.m.), and the ever-popular Hunky Jesus Contest (3:40 p.m.), there will be a big line-up of performers with very punny names from Noon to 2 p.m.

Then, the Rebirth Processional will immediately follow the Hunky Jesus Contest at 4 p.m., traveling from Dolores Park to the Castro and ending at Noe and Market Streets, where the AfterBirth Party will begin. There will be an Energy 92.7 stage with entertainment between Cafe Flore and Lookout. The party goes until 8 p.m.