How ahead? The morning of? They would keep quite well at room temperature, lightly covered. Day before? I would still keep them at room temperature, but tightly covered, the phyllo will soften a bit. A few days? I would refrigerate them, covered....but the phyllo will lose quite a bit of its wonderful texture.
Yes...but the phyllo dough won't be quite as fresh (but still yummy). We make muffin tin "quiche" with phyllo as the crust and they "hold" up to an hour in the oven and still tastes yummy! So I don't see it as an issue, but test it first to see if the quality is what you want to serve.
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