Smile don't wave Smiling is like oh she's friendly, waving if he didn't know you would be like wtf, who is she? haha Try and figure out if you have any mutual friends that will introduce you two!
why dont u just go up and talk to him and introduce urself? smile and wave? he might get confused cause he doesnt even know who u are..so if u wave at him, hes going to wonder why ure waving at him..talk to him..dont make it so confusing for the guy