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Message: <blockquote data-quote="Thatwhichlurks" data-source="post: 6969277" data-attributes="member: 6867742">The rules for Magic Circle also specify that celestial, fey, fiends, and elementals can't leave the circle should you choose to invert it. Also, the circle attempts to prevent teleportation or interplanar travel into the circle(outside in this case) by forcing the creature to make a Charisma saving throw. This also applies to when the duration for a Conjure Elemental/Fey/Celestial(or Planar Ally if you want to keep your gold) ends, since the creature has to use interplanar travel to exit the circle to go back to whatever plane it was summoned from. I just assumed that since that the creature is immediately dismissed back to its home plane when the spell ends, the act was "willing."  I agree with you on both of your latter points, someone else could use Magic Circle while you summon your creature (and vice versa), and it is ultimately up to the DM if those seconds between the duration of the conjure spell and the casting time of Planar Binding matter. If your DM rules that the seconds don't matter, then most likely the Magic Circle would come in handy for Planar Ally, Gate, or one of the UA demon summoning spells (if allowed).</blockquote>