Illini Student Musicals will be performing the classic musical “Grease” this weekend at Lincoln Hall Theater. The group is presenting four full runs of the show this weekend: Friday at 7:30 p.m., Saturday 4:30 p.m. and 7:30 p.m. and Sunday at 2 p.m. Set at fictional Rydell high school in 1959, “Grease” is the story.