A few weeks before Eid Al-Adha is usually a busy time for Dudi Rustandi, an employee of a private information technology firm based in Indonesia’s capital city of Jakarta. For the past 20 years, Rustandi has volunteered at his local mosque in South Tangerang, south of Jakarta, to organize the Qurbani, or annual sacrifice ritual, held on the holiday to mark the end of the Hajj season. With fellow members ...