Friday Nights In the Summer

    Davening at Zman means davening mincha before sunset and maariv after sunset
    Davening at Plag means davening mincha before Plag HaMincha and maariv after Plag HaMincha
    Davening at Plag means davening mincha and maariv between Plag and Sh'kia. (This is the most halachically problematic option.)