Each organiser sets the maximum capacity of their CCQ, and this season some events are much smaller: Seville has 128 seats, Lorca-Breizh in France has 200 and Malmö has 256. Last season, European CCQs had between 76 and 902 players. With so few seats, don't leave registration until the last minute.
Source: lorcanaplayer.com (26/27 season)