The VVV is the place to find out about activities and events going on in the Netherlands. As the tourism offices, it’s their business to know these things and to encourage you to explore the area. I visited the VVV office in Sittard during my last trip to the market. They had a huge variety of brochures and booklets available for free. They also had maps for hiking and biking for reasonable prices and products from the local area.
Go to vvv.nl for information about the rest of the Netherlands.