Some membership fees could include things like fees for.... I'm a CPA. CPA fees are paid. That's considered a membership fee, so it's not professional services, but just within the standard object definitions, membership fees end up in there.
It could be some international organizations. I believe the OECD is one that we pay a membership fee to. That would be a membership fee.
“Hospitality” is events where non-public servants in general are provided hospitality, often for reasons of diplomatic purposes or things like that.