While Patricians have a bourgeois background and are not proper members of the nobility
In Italy, they actually are, especially in the major republics (but not only; e.g. patricianship of Ferrara would still qualify). Technically, they're barely above the lowest untitled nobility (nobile), so someone designed as a patrician (e.g. Napoleon's father had this title, and Napoleon's birth announcement in the gazette listed him as a proper
ecuyer) is just a bit above someone who is simply a nobleman or noblewoman and below a knight. But in practice the title of patrician of Venice or Genoa was cool enough for monarchs to list closer to the end of the list, where small feudal seigneuries would be mentioned (e.g. for Savoys). Also, when they actually retained a feudal holding, a castle or even something grander than that, they could reap the benefits of the status (unlike in other countries, where it was more complicated). In Italy, sometimes feudal families moved to the city and became patricians; in such a case they retained the feudal nobility status too. So I guess you could treat them on par with the unlanded generic courtiers (invite steward/debutante random nobles without a family).
In the HRE, patricians in the imperial free cities were also considered noble; in fact, being listed as such prior to 1350 without a preceding patent puts one in the category of immemorial nobility (the Uradel). Untitled but anyway. On the other hand, hanseatic patricians in what was not an imperial free city would generally be Großbürgers in the later period but when need arose such folks suddenly found themselves with a von to their name and married anybody they wanted, male or female, as well as taking high military commissions.
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