Thanks for the answers! ~*ArwenEvenstar*~ you explained it very good! .
Actually I always thought they were leaving because all the wars and darkness that came in Middle-earth, they need peace and peaceful. Sometims its hard to see Elves as warriars
Well, thanks for the right answer!

^ Of course!! No problem.

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"Hogwarts will always be there to welcome you home."

that`s the Vala`s Middle earth`s `policy.they like the elves,and hope that they could accompany them,so they summon the elves to Amen.

since the Third Age,the power of elves were dwindled,and their sorrow could not be healed if they choice to stay at middle_earth.so they went to Amen and cured their sorrow and giref ,ect.....

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if the constellations appeared only once in thousands years ,imagine what an exciting event it would be.but they`re up there every night ,we barely give them a look.