Kilts at the Renaissance Faire

This is Jane Stain's entire bestselling Renaissance Fair series ~ a suspenseful blend of Druidic magic, feuding highland clans, and a modern woman trying to make sense of it all ~
~ The moment budding drama teacher Emily Shaw lays eyes on handsome highlander Dall MacGregor, she wants to ... have his babies. But then she's afraid she'll never see him again. The faire people seem bent on keeping the two of them from talking privately. But over the summer, she talks her way into time traveling with him to 1540.

Evangeline Andrada is a time traveler when she meets Peadar MacGregor, a 'cow boy' Scottish slave on an English settlement in the New World. His kilt has been cut up to make shirts, and she is part of the team sent to rescue him. But when the two of them return his sister to the Highlands in 1560, they get stuck in that time ... and shipped off to help someone named Shane O'Neill in Ireland.

Even in the modern world, Druidic magic controls them all. It brings them together and allows them to explore history. And they think they are escaping it.