Tristan Varner arrives at a special barbecue at Foster School, where he attended third grade last year. Tristan, 9, who was diagnosed with brain cancer in early July, was treated to one of his final wishes, barbecued chicken, by the Sweet Home Elks and Denim and Pearls Catering on July 24. The event was put together by Jo Ann McQueary, locally representing the Make A Wish Foundation. The Knox Brothers performed, and children enjoyed a…