Inviting parents for graduation

[jck]

I am graduating in may 2009 and I am currently on OPT. I wanted to invite my parents to my graduation but I had a question about the I-20. My I-20 has work authorization information on it, I was wondering if that would be a problem at the US consulate. Do I need to send any additional documents? Please help me.
Thank you in advance

[immihelp]

I don't see any problem with that.

[kabkaba]

There should be no problem because of that. All you need to send is an invitation letter and copies of your I-20, visa etc. (not required, just supporting documents) and they will have to show sufficient funds and ties to home country.