If I remember correctly there are some going to Budapest in April / May. We will be there the 1st through the 10th (I know, too short, buy I have to work). We have a guest this time so I've begun looking for things to do to make it special for her.
So far I've found:
great concerts at Opus Jazz Club, MUPA and Budapest Jazz Club.
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Falk Miska utca has an event to showcase the art galleries and antique shops; with food and music in the street on the 5th of May.
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The Saturday morning farmers market at the Hunyadi ter market hall is always an experience as are the vendors Saturday and Sunday at the Gozsdu udvar.
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I'll post more as I find it.