Katydids and paper wasps - possible symbiotic relationship?

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Last summer I encountered an interesting phenomenon - I came across two paper wasp nests, both of which had a group of katydids congregating around them. I looked online but was not able to find any recorded instances of positive interactions between katydids and wasps. Does anyone know what could be going on here?
Here is the observation, with photos of one of the nests: http://www.inaturalist.org/observations/223604454
As there were two nests, both with a group of katydids, and no katydids to be seen anywhere else nearby, I don’t believe it was a coincidence

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Left this comment on the observation. Reposting here for the sake of forum readers that might (have) miss(ed) it.

maybe an explanation:
https://www.jstor.org/stable/2424050

“ABSTRACT: Individuals of Ancistrocercus inficitus (Walker) roost in association with nests of five genera of wasps…
the wasps…apparently afford these otherwise defenseless tettigoniids with some measure of protection from predators and/or parasites. Individual orthopterans are faithful to particular nests until disturbed.”

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Very interesting! Using the wasps for protection would certainly make sense, as long as the wasps don’t get hungry for some katydid (I am not sure whether paper wasps are predatory or not). The strat certainly worked for me, there was no way I was going to mess with the katydids there, I took that pic from a safe distance

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Paper wasps are highly predatory, but they forage independently and prefer smaller and softer prey. The katydids in your observation and in the paper linked by @eleggua are both far too large as adults at least for any single polistine to take on. I would be interested to know whether the wasps get anything out of this seemingly commensal arrangement. The linked paper does suggest the katydids may act as an additional warning system for the wasps, but whether it actually makes a difference is iffy.

On an unrelated note, I did a double take reading the abstract of that article. I thought it was talking about Ancistrocerus, a genus of solitary predatory wasps. It makes me wonder whether a similar dynamic exists among any solitary wasps as either receivers or providers of protection.

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