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New players can be introduced by having them be in a position to interact with either group, be that some sort of conflict or convinent running into, the method easier to discuss with a character already in mind. 

The first group is currently at the South most Falken farming village, a short ways outside the Capitol. All involved members are travelling East, but with the bridge gone that means going around the Lake of Reflection. There's safety in numbers so for the time being they're traveling together.

The second group are on their way to and should soon be at the Twilight Fields. The leaders of the party are from Tour de Rouge, on a mission to find the person or persons involved in the assassination of the Choir's former leader. They're accepting any help they can get with promise of substantial payment for helping to bring in those responsible.

There's much more to each plot line but that's the basic outline of why each group is going where. Again it's easier to conceive a way to insert new characters after we already have an idea on who they are or what they may be up to, and myself and the other GM personally work with each application to help bring it together