Ohh Boy , one of my fav styles !!!!
but a can of worms - "reggae" covers many styles , and depends on the crowd your playing to ..
if its a older 'general crowd' try some from these
Super 70s Reggae - EMI VTDCDX 726 - a good primer 3cd box of early/mid/late 70s uk hits [not much Marley tho]
The Trojan Story - METROCD 518 - a bit more 'eclectic' , but good floor fillers for old Mods/skins etc ,
Also look out for Prince Buster - FABulous greatest hits - TJCCDD 071 , [NOTE - there are at least 3 different versions of this cd - this one is 18 track & good 'cuts'] -