do you want embedded fonts in your epub, or just let the device choose the font? If your ok with letting the device pick the font, just delete the "fonts" folder, and it should validate. I usually stick to basic font, and don't embed any.
The date thing is just metadata. All epub have to have a date, and for some reason InDesign doesn't export the date in metadata. In your content.opf file put in:
Quote:
<dc:date>2011-06-24</dc:date>
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Just make sure its within the <metadata> tags at the top. You can also put it in in other formats such as YYYY, YYYY-MM