Not a class you buy but a group you join. Kids stay with the same cau and the same friends year after year, from age 6 into their teens, with weekend outings and summer camps built into the year rather than sold separately.
Secular Catalan scouting with 43 local groups (agrupaments) across Catalonia, 12 of them inside Barcelona, where kids join a cau for games, outdoor projects and camps. Kids move up through age branches, from Follets at 6 to Pioners at 17. The "On som" page lists every group with its address, email and social accounts so you can write to the one nearest you.