The 'Grand Velsen Cathedral' does not exist and therefore has no tickets. Most local churches do not require tickets for entry.
Since the 'Grand Velsen Cathedral' is not an actual location, there are no tickets to purchase. For the few local churches in Velsen, entry is typically free, and no tickets are required.
For major cathedrals in the region that do charge an admission fee, such as the Sint Bavo in Haarlem, tickets can usually be purchased on-site at the entrance. In some cases, purchasing tickets online beforehand can offer discounts or allow for faster entry.