I don't know anything about all this

Not a very good excuse for non-involvement ... after all someone might give you a ton of paper to read or force you to examine every page of this web site.

You'll have to think of a good reason why you can't be expected to know anything. (You can't read? You can't listen to a tape? You cant watch a video? You can't communicate with the visiting mission partner?)

How about saying you don't know anything because you don't have time? Only trouble is they might point out that it was probably more a matter of what you put priorities on.

The trouble is that it takes very little time or trouble to get some information - keep looking at this website or contact Crosslinks! 

The danger is, of course, that you might get interested ... and that could lead anywhere!