› Visitor's Information › Groups Groups Small groups Groups of up to 9 people are welcome on Mondays to Thursdays before 11 a.m. and after 2 p.m., and on Fridays before 11 a.m. Large groups Groups of 10 to 45 people are welcome on Mondays only. There is a handicap limit of 24. Payment An agreement with the secretariat constitutes an option only. This will become final on receipt of payment. Please transfer payment to account number: NL38FVLB0227251806 under the name of the KHG&CC.