A lecture hall at Hofstra University was packed with more than 400 attendees for a forum Saturday to discuss the process for a casino at the Nassau Hub, a 72-acre property that remains the largest undeveloped stretch of land in the county.

Many of those in attendance were construction trade workers, more than three dozen in neon green shirts that read “Opportunities for Long Islanders,” with Sands marked in the front. Las Vegas Sands, a casino and resort company, has proposed spending an estimated $4 billion to build a hotel with a full casino, performance venue, restaurants and more at the Coliseum site.