[MMM]

You are looking for an interpretor, not a translator. And access to the events is not compensation, it would be required to do the job.

If you are inviting a non-English speaker to teach and speak, why are you not budgeting for a professional interpretor for an event in less than two weeks?

There is no point in having him come if his words will not be understood without the help of a professional interpretor, and professionals do not do events like this for free (which is what you are offering in compensation).