Making this “learning” sessions sounds unrealistic to me.
GDevelop is not that popular it doesn’t worth doing it with 1 or 2 people and I doubt you could find at least 5 people at any moment to work with. Also, what if a group becoming more experienced a little and suddenly a complete beginner join the session have no clue what is going on, what a sprite is. Would you be holding two sessions or three or even four?
I believe such “learning project” would be better to be an actual project shared in modules here on the forum on the wiki so new users can take a look at each module, learn from it, may ask questions on the forum and essentially may build a complete game from this modules.
For example a platformer game. One module would be about moving a sprite left and right. An other module would be about jumping, an other about double jumping an other about wall jumping and other about playing animations when moving an other about playing sounds…etc and by putting this modules together, you get a basic platformer character that we can control and by moving on slowly you could build a complete platformer game with points, score , life, enemies…etc.
Of course each module must be compatible with each other and made with the others in mind so they can work together without much modification.
This way it would be easier for new people to learn how things can be done and fun to make a complete game from such modules, but again, it mean learning alone and by the end of the day it would be not much different from a tutorial.
Also, I don’t know how well GDevelop could support this modular thing. I believe you can import, export external events and scenes but I have never tried, so maybe it would be a pain to bring two modules, the images, objects, events, scenes, sounds in to one project and it would just become a mess by the end.