In nearly every society around the world, fruit holds cultural significance, whether as a token of hospitality, sympathy or simple good will. The communal implications of pomiculture are what inspired the artist collective Fallen Fruit to beginning mapping L.A.'s public fruit trees a decade ago. The group is behind a new installation at the Skirball Cultural Center, even as it plans a public Urban Fruit Trail with 150 trees near MacArthur Park. One of Fallen Fruit's most beloved events is the Public Fruit Jam, and after a two-year hiatus, the community-building activity is back, inviting families, friends, couples and singles to Old Town Pasadena for a hands-on experience. If you have a surplus of home-grown, organic and/or store-bought edibles with seeds, bring your own fruit and take part in this community-building activity to learn how to make some tasty jam. Drop-in sessions last about 45 minutes, with groups of three to five people finishing with jam they can either keep, trade or hand over to a tasting table where others can sample their freshly made foodstuffs as well. One Colorado, 41 Hugus Alley, Pasadena.; Sun., Aug. 10, 11 a.m.-2 p.m.; free. (626) 564-1066, onecolorado.com, fallenfruit.org.