For an event in the far future, my Dutch games society would like to invite a few local (in this case western Netherlands or possibly BeNeLux) RPG designers to come to us, play their games with us and talk about them. Our FLGS stocks games of one indie publisher living in the city (and I have some contact details), and at a small local convention last year we met another designer living in the larger region, but beyond that I'm stumped for ways to start looking.
There is no Indie-Meetup in town to ask around and maybe even have the chance that local designers might turn up there. For meetups elsewhere in Holland, I don't know how to find and know what's useful.
RPGGeek.com has a huge list of designers, but it's not possible to search through them. The “Designer” search does not go through the full-text of their description, and many people don't have a listed location.
Dutch is generally a small language and games rarely translated into it, so I cannot pilfer the Dutch-language section on DrivethruRPG for appropriate publishers and continue searching from there.
So, how do I find RPG designers from (roughly) the Netherlands and northern Belgium?