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A tarp is your only option if you can't get back to it for that long. Overnight and a moderate rain with little or no wind might be ok with just the felt. You'll have to fold and tie off the tarp at the hip.
You nail the tarp to the soffit or fascia. Roofing nails are ok. With a gable roof you can just drape the tarp over the roof but with a hip you have to fold it back (kind of like gift wrapping a box) then tie off the corner using at least 2 separate lines. Go right over the vents. Best to put a blanket or furniture pad over the vents to prevent them from tearing the tarp.
I should add that you need to keep at least the main stack vent open to the air. We put an elbow on the top of the vent which will also protect the tarp