From EBBS_SCRIPT.txt:

;8: Special Events
; 8a: The Chersonesos Event
; 8b: Tomb Of Alexander
; 8c: Baktrian Independence
; 8d: Roman Triumph
; 8e: Seleukid Anabasis
; 8f: Pahlava Shahanshah
; 8g: Sweboz Triumphs
; 8h: Devastation Script
; 8i: Nomad Horse Discount
; 8j: Gauls - Epeiros Alliance
; 8k: Celtiberian Alliance
; 8l: Rhegion (Romani only)
; 8m: Spartan Agoge Messages
; 8n: Xanthippos
; 8o: Yuezhi Invasion
; 8p: Casse Landing
; 8q: Naravas

Some of these do not work though, like 8b, 8c and 8e.