Yes, you can call him for convocation.
He will need to apply for Visitor visa.
You may send the following documents to the family/friends you wish to invite; they can
use these as supporting documents when applying for a TRV at the Canadian
Consulate back home.
1. Photocopy of your passport
2a. If you are currently enrolled in school
Photocopy of your study permit AND a current Confirmation of Registration letter.
Your study permit should be valid for the duration of the time that your family/friends
intend to stay in Canada.
You will also need to include your official transcript.
or
2b. If you have completed degree requirements
Photocopy of your post-graduation work permit and/or study permit AND current
Confirmation of Registration letter. At least one of your immigration documents
should be valid for the duration of the time that your family/friends intend to stay in
Canada.
You will also need to include your official transcript.
3. Letter of invitation written by you
Note: The International Office does not provide letters of invitation; you must write the
letter of invitation yourself. The following are guidelines taken from the CIC website. For
more information, refer to http://www.cic.gc.ca/english/visit/letter.asp
Some visa offices may require that your letter be notarized by a Notary Public. Please
note that a letter of invitation does not guarantee that a visa will be issued. Visa officers
assess the applicant to determine whether they meet the requirements of the
Immigration and Refugee Protection Act. Your letter must include all of the following
information.
Good Luck.
