No, tickets are not required as there is no entry fee for Central Vlaardingen Market. It is an open public market.
Central Vlaardingen Market is a public market space, not a ticketed attraction. Therefore, there is no need to purchase tickets to enter or browse the stalls.
Visitors simply walk into the market area. Purchases are made directly from individual vendors for their specific goods. Payment methods vary by vendor, but cash and often debit/credit cards are accepted.