Some ideas for information gap activities might be:
1. Picture Gap: One participant has a picture that he/she explains to the other participants who draw the picture according to the explanation. At the end of the activity the pictures can be compared to see where mistakes in explanation or understanding were made.
2. Go Fish
Some Go-Fish cards. There are two of each square, and many of the squares differ only by minute details, therefore, much explanation is necessary (as you will be able to tell from the video below).
The video below was taken during one of our language sessions in which we played a variation of "Go Fish" using the cards picture above. My husband is on the left, and a language helper is on the right (I am taking the video :).
3. Guess Who
4. I Spy - can be played with busy books (where's waldo, or I Spy books, etc.)