Large public gatherings can create difficulties, including inefficiency, errors, controversies, and issues with payments for unbanked employees, particularly in workforce attendance and payroll management. This research develops a Decentralized Workforce Management System (WMS), a blockchain-based smart payment system with biometric verification and Global Positioning System (GPS)-based attendance tracking, to address these issues. The system utilizes digital wallets to provide financial services to unbanked workers, promising transparency, security, and accuracy. By way of comparison, blockchain payroll processing would require only one day, compared to the five days typically needed using traditional systems, and would significantly reduce payroll disputes and attendance adjustments. Overall, the system had a positive impact, enhancing worker satisfaction from 60 to 90%. The scalability tests demonstrated that the system could process 1000 transactions per second during an event attended by 10,000 workers. The results validate the fact that blockchain does not eliminate errors and operational breakdowns. Still, it remains feasible even when the internet is unreliable or various levels of IT literacy exist. Before launching the real-size installations, further development through highly advanced smart contracts may improve workforce scheduling and acceptance. This work shows that blockchain can be effective in controlling the large, temporary workforce.