Yes, Under Dutch tax law, you can deduct the training costs you personally made (e.g. the admission fee). Essentially, you do not pay income tax on your admission fee (minus the threshold amount). The same applies to your tuition fee, should you pay for that yourself. Please check the site of the Dutch Tax Authorities (Belastingdienst) for more information.
For students: Do I have to pay VAT?
For employers: Do I pay any tax on my employee's tuition fee?