The Basketball-Gemeinschaft-Berlin Zehlendorf e. V. organised the 38th annual International Zehlendorf Whitsun Tournament in 2024. This tournament attracts up to 250 teams and 2,500 players from all over Europe, from under 12s to seniors.

Ethical production is a key concern for those responsible for clothing the more than 400 volunteers. The T-shirts for the volunteers and the tournament winners are produced according to fair trade standards. Compliance with social criteria is checked by independent certification bodies and made credibly visible by means of recognised seals or labels (here: Fair Wear Foundation). 

Those responsible are also careful not to produce new T-shirts every year. To save resources, they are printed without the year and in the same design so that they can be reused for future tournaments. The challenge here is to estimate the exact number of new and returning volunteers, as the T-shirts are given away to them.

The club is supported by a grant from Berlin State Sport Association. The umbrella organisation covers up to 50% of the total eligible costs – an important financial contributor for the clubs and associations. Nevertheless, the organisers of the Whitsun tournament emphasise that they will continue to focus on fair and sustainable production conditions even without funding.