Invitation letter & visa

Download the appropriate invitation letter for your visit and find general guidance for visa applications to the Netherlands.

Choose the correct invitation letter

ISAM 2026 and the Global Addiction Therapeutics Innovation Day (GATID) take place on different dates and require separate registration. Please download the invitation letter for the event you will be attending.

28th Annual Global ISAM Congress

1–3 October 2026

Use this official invitation letter to support a visa application in connection with your attendance at the 28th Annual Global ISAM Congress.
The letter does not constitute a visa, confirm your congress registration or guarantee that a visa will be issued.

ISAM 2026 Letter of Invitation (PDF)

Global Addiction Therapeutics Innovation Day (GATID)

30 September 2026

Use this invitation letter if your visa application relates to attendance at GATID 2026.
Please note that a GATID ticket is valid for 30 September 2026 only. Separate registration is required to attend the main ISAM Congress from 1–3 October 2026.

GATID 2026 Letter of Invitation (PDF)

Visa application guidance

Visa requirements and application procedures depend on your nationality, country of residence and personal circumstances. Always consult the official information for the country where you will submit your application.

Check whether you need a visa

Use the official NetherlandsWorldwide website to check whether you require a visa for the Netherlands and how to apply from your country of residence.

Check if you need a visa

Prepare the required documents

The documents required may differ by country and individual situation. Depending on the applicable checklist, you may be asked to provide an invitation or proof of registration, details of the event, proof of accommodation, travel arrangements and evidence of how your stay will be funded.

Please check the official country-specific checklist before submitting your application.

View the official visa checklist

Apply in time

Visa applications must be submitted by the traveller through the relevant embassy, consulate or visa application centre. Applications can generally be submitted up to six months before travel. Processing may take longer when additional assessment or documents are required, so we strongly recommend applying as early as possible.

Important information

The invitation letters are provided solely to support a visa application. They do not constitute a visa, serve as proof of congress registration or guarantee that an application will be approved.

Participants are responsible for checking the applicable visa requirements, submitting their application on time, attending any required appointments, providing the necessary documents and covering all related costs. ISAM 2026, GATID and Congress Care cannot submit, expedite, monitor or influence a visa application or decision.

Visa refusal, processing delays or the inability to obtain an appointment do not alter the applicable cancellation and refund conditions. Please review the cancellation policy on the relevant registration page before registering or making travel arrangements.

Frequently asked questions

Find answers to common questions about invitation letters and visa applications for ISAM 2026 and GATID 2026.

Which invitation letter should I download?: Download the ISAM 2026 invitation letter if you are attending the main congress from 1–3 October 2026.

Download the GATID 2026 invitation letter if your visit relates to the Global Addiction Therapeutics Innovation Day on 30 September 2026.

If you are attending both events, include both letters with your application where appropriate.
Do I need to register for the congress?: The invitation letter and congress registration are separate. Downloading an invitation letter does not register you for the event.

Registration is required to participate unless the organising team has explicitly informed you otherwise. Please visit the Registration page to register for the main congress. A separate registration is required for GATID 2026.
Does the invitation letter guarantee that my visa will be approved?: No. The invitation letter is provided to support your application only. It does not constitute a visa and does not guarantee approval. Visa decisions are made solely by the relevant immigration authorities.
Can ISAM 2026 or Congress Care apply for a visa on my behalf?: No. Visa applications must be submitted by the applicant through the relevant embassy, consulate or visa application centre. The congress organisation cannot submit, expedite or influence an application.
Which documents do I need for my visa application?: Requirements vary depending on your country of residence and personal circumstances. Please consult the official visa checklist for attending an academic event and select the country where you will submit your application.

You may be asked to provide an invitation or registration confirmation, proof of accommodation, travel arrangements and evidence of how your visit will be funded.
When should I apply for my visa?: Visa applications can generally be submitted up to six months before travel. As appointment availability and processing times may vary, we recommend starting the application process as early as possible. View the current visa processing times on NetherlandsWorldwide.
What happens if my visa application is rejected?: Visa refusal, processing delays or the inability to obtain an appointment do not alter the applicable cancellation and refund conditions. Please review the cancellation policy on the Registration page before registering or making travel arrangements.
Who should I contact with questions about my application?: Questions about visa requirements, appointments, supporting documents, processing times or the status of an application should be directed to the relevant embassy, consulate or visa application centre. Visit NetherlandsWorldwide to find the procedure and contact information for your country of residence.

The ISAM 2026 Congress Secretariat can assist only with questions about accessing the official invitation letters.