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I want to say "what kind of evening are you having?". I think 何で can be used,
but I dont know how to fit evening into the sentence structure. I have:

何でイブニングがあるか？

Is this right? Would the sentence structure be similar in general?

"What kind of X do you have?"
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2013-12-08T03:30:29.080
13640
2013-12-10T12:08:25.790
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question
english-to-japanese
How can I ask what kind of evening one is having?
何でイブニングがあるか？sounds to me like "Why are there evenings?".  
"What kind of~" would be "どんな~", and "What kind of X do you have?" literally
translates to どんなXを持っていますか. e.g.

> どんなドレスを持っていますか? What kind of dress do you have?

When you ask how one's spending their time I think you could say

> どんな～を過ごしていますか。  
>  どんな～をお過ごしですか。(formal)  
>  ～を、いかがお過ごしですか。(formal)

...normally in writing.
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2013-12-08T04:22:10.990
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2013-12-08T04:22:10.990
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answer
If it is already the evening ("How is your evening? Having fun?"), you can
say:

> 今日楽しんでる？

(inspired by ちょこれーと's comment)

If it is not the evening already ("What are your plans for this evening?"):

> 今晩何してる？
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2013-12-09T06:49:43.863
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2013-12-10T12:08:25.790
2013-12-10T12:08:25.790
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answer