"relatedness" or "tagging" is typically handled generically in Wikidata through the use of "part of" and "has part" properties.

They work terrifically well to apply some generic classification needs such as those of the Black Lunch Table efforts.

So, an alternative to the current modeling could be...

Are they only persons ?  if so, mark them as "participant of" -> "Q28781198" Black Lunch Table

Are the topics needing some "tagging" for classification sometimes more than persons ?  if so, mark them as "part of" -> "Q28781198" Black Lunch Table

-Thad

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