In the Netherlands, the Equal Treatment (Disability or Chronic Illness) Act applies. For events, this means you must make reasonable adaptations for people with a disability. In practice: provide wheelchair-accessible entrances and exits, accessible toilets and induction loops for the hard of hearing. Also ensure enough space between tables and chairs.
Actively ask about accessibility needs at sign-up. For large events, an accessibility plan is recommended. Live Impact assesses venues for accessibility as standard.