The characters have escorted Garaele, a priestess of Tymora and a Harper agent, east from Aglarond to the new nation of Semphar. Rather than ride for almost 1100 miles, the party were teleported to the city of Dhaztanar, the capital of Semphar, by a mage contact of the Order of the Gauntlet.
Some of the characters all have missions in this part of the world, depending on their faction membership.
Because of all the player movement and character recreation, we are treating this as sort-of a new campaign. If you went through the Lost Mine of Phandelver and want to keep the same character, then great! Your character already knows the priestess Garaele and has some motivation for joining her.