You can usually find this elf in 3 places: at her home, in the elf enclave; in an abandoned house or on a ship. It depends on your actions in the game.
About the events. Their launch largely depends on Celica's development as a mage and her relationships with other characters. The more you help Celica become a powerful mage, the easier and faster the gameplay becomes.
Therefore, if you notice that there are no new events: go to the bartender, the fortuneteller. And if they are silent, go with your friends to a duel with monsters, using potions and artifacts from your inventory in the process.