I'm glad to hear you're enjoying Hogwarts! Yes, the 5th year can indeed zip by if people have been waiting to play some big cards. But remember that the game doesn't end as soon as Gryffindor passes the 500 mark. Finish out the whole round before doing the final scoring.
Here are answers to your questions:
The Courtyard is considered inside the Castle.
The "Gryffindor Common Room" is the same place as Gryffindor Tower. Sorry about the typo!
To "play a card" means to place it in a location. If no one is there, then it is simply left face up in that location.
If you start a turn with a card in your space, then the only way to encounter that card is to spend a Move Action and declare you are moving "0 spaces" to encounter that card. Since you can't play a card to a space that already has a card in it, you would not be able to play any cards to your space in that situation.
However, if you were using the "Time-Turner" to perform 2 Actions in a row, you could "Move 0 spaces" to encounter the card in your space, and then play another card to your space as the second action.
If your space was empty at the start of the turn, you could indeed use "Lumos Solem" to play 2 cards to your space, assuming you successfully encounter and complete the first card that you play before playing the next card.
Please let us know if you encounter any other questions.
I hope you continue to enjoy Hogwarts!
Andrew
