The arts organization, which aims to transform at-risk youth and families, received a special gift — a donation worth about $125,000 in tables, chairs, tents, bounce houses, bar counters, lights and canopies — for the nonprofit’s fundraisers. The donated items will come in handy now that the group has many new people to accommodate. The 15-year-old organization, in the last five years, has doubled its number of people helped because of outreach and grants. The center operated out of a storefront office and had a client list of 150 children. With a move to a newly equipped facility in 2005, it serves 4,000 to 5,000 children a year.