This was similar to the angle I went with in my presentation I gave at Linux Weekend Tirana and OSCAL 2017. Both times, the audience was interested and engaged since many of them had never heard of a project like this, but they knew the services I listed off when I said who was using MusicBrainz (Spotify, Google, Amazon, etc.).
Interestingly, I had two things that also did well for an international audience. People were interested in being able to add local music in different languages or scripts (or really, that there was support for such a thing). I tried to frame it as a way of documenting culture and helping local musicians who might not perform in English. Also, as far as contributing, I was also asked about translation opportunities, which I ended up asking in MusicBrainz to find out we use Transifex for translations. These might be good points to consider too for folks presenting to an international audience.
I highly encourage you to go for it! 
The worst that can happen is that you get told no. I’m sure you could also get feedback on a proposal either here or in IRC on a proposal bid before you submit it.
The way that I could see the MetaBrainz staff having a big impact on this is to help create resources to enable community members to go out and spread the word more easily. For this, I’m drawing on a lot of my experience in the Fedora community and the Ambassadors program we have. While I don’t think the travel funding / financial support is something that would work well in this community (yet), the types of resources that the Ambassadors have helps us be productive and present Fedora in a consistent and reliable manner.
Some of these resources include…
- Talking points: Key information about software, community, or other critical points of information
- For MetaBrainz projects, this could be key points about describing what the project is, “at a glance” metrics that show how big a project is, who in the real world is using and depending on a MetaBrainz project, where it’s implemented, etc.
- Design resources: Print-ready resources (e.g. logos, banners, etc.) for creating stickers or other physical merch
- It might not be feasible yet for MetaBrainz to send swag for free to contributors, but this at least allows someone with a few extra dollars to take some cool MetaBrainz project swag to a conference or an event to distribute, and make sure that it follows correct design guidelines. This is something we’re adamant about in the Fedora community so that way all of our physical items across the world always use consistent branding.
- Presentation templates: Themed slide deck templates that use MetaBrainz / MusicBrainz color schemes and/or logos
- While a smaller thing, it would be nice to standardize some sort of presentation template so people could more easily create slide decks that thematically relate to MetaBrainz / MusicBrainz
From my perspective, it would be really cool to see MetaBrainz staff help foster the development of some of these resources. By doing this, it enables the community to go out and spread the word about the cool projects under the MetaBrainz umbrella. Perhaps later on, MetaBrainz could take a more hands-on approach with some sort of community advocacy / representation sub-project, but for now, these things would enable ambitious community members to more easily bring “heat and light” into all of the cool, open source work happening here. 
@Freso Does all of this make sense or does it clarify how I think MetaBrainz could help foster community advocacy in this way?