If you already fought her probably don't do again like said i don't remember unlock raid event if you already did that
dont know how to do that either^^ right now i think i finished all main girl quests except ryoko. i walked trough all citys again and talked with people and got a few quests (like def the dwarf against mages with sniper) but now i dunno. di i have to advance the time for more quest or is the game over then?