Spanish term (edited): la organización de eventos privados, convenciones institucionales y manejo de grupos cerrados.

I think that the original was carelessly drafted, and that "eventos privados" and "grupos cerrados" refers to the same thing. This is my suggestion for resolving the redundancy, and thus improving on the original.

Sometimes you can wrack your brains over issues like this until you realize that the problem is with a sloppily written original text.

I do not know that this is the case here, but I strongly suspect that it is. If not, I would challenge other responders to meaningful differentiate between the two terms. We can then see if whatever solutions thus generated are more plausible than what I am suggesting.

Suerte.

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Note added at 17 mins (2009-12-11 02:59:19 GMT)
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CORRECTION:

the coordination of private events and groups, and of organizational conventions.

[to avoid ugly repetition of "organization....organizational."


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Note added at 18 mins (2009-12-11 03:00:52 GMT)
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Or, possibly, even "large conventions."

I don't think that "institucional" has any specific meaning here, and that the events in question could be corporate or professional in nature, or perhaps those of non-profit entities.

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Note added at 1 hr (2009-12-11 04:12:00 GMT)
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Stated otherwise, I believe that the "eventos privados" and "grupos cerrados" belong to one and the same semantic unit.