Other ideas
Discussion on regular courses
Since studies in the Netherlands are actually with quality, it might not need to add some random personal learning. So then, to gather more people, plan is to make monthly meetups and just share what we learned in the past month.
Quantum computing tutorials on YouTube
There are not so many basic tutorials, however this field starts gaining popularity. Tutorials could cover: 1) All the basics (like in Quantum Soar YouTube series); 2) Coding with Qiskit the basics; 3) Max-cut and VQE for chemistry - basics; 4) Quantum hardware basics - general types of hardware; 5-...) Taking one scientific article and making an analysis together with all the background needed to understand.
Full courses
There could also be continuous series of lectures about one subject - i.e. a full course. For example, course of Theory of Computation. Taught probably just by students and not free (because otherwise no one would take it seriously). But for try-out it could be integrated to the standard meet-ups.
Lecture movie nights
Organize MIT or other lecture movie nights - gather together and just watch non stop Quantum Physics lectures or some other stuff.
Chemistry and electronics lab
It would be great to have a very minimalistic chemistry lab to do some basic experiments for educational purposes. Ant it would be also nice to have electronics lab - all in one place: components, soldering, etc.
Book of Everything
Geometry textbook for school
A textbook only about geometry at roughly highschool level. For Lithuanian schools. But probably would be great idea to write it also in English. And, ofc, have some digital version of it for visualizations, automations etc. The content would begin with very strict axioms and everything would be very rigorous. Also would include a geometry tikz tool for drawing geometric figures. Maybe also using Coq Proof Assistant.
Other axiomatic systems
Strictly formalize other axiomatic systems, something like Principia Matematica. Or just analyze more the Principia Matematica and then rewrite everything in humanly comprehensible language. Need more research on this...
Philosophy
The final product would be a philosophical system that would describe how the whole world works, very similar to Bertrand Russell philosophy, but more formalized. In other words - the whole book would be about matematical logic and mathematical philosophy implementation in general philosophy and everyday life. For start - it would just describe the "absolute truth" and how to debate someone based on contradictions.