look luco, we all can obviously extremely clearly see how hard you're trying to get things working, but trying to do things like in in your own way really isnt going to work. or at least, it wont work very well, and won't be ideal, and only as a one time thing.
its very unfortunate that you're in this situation, but if the problem simply lies in the fact that you're young and have protective parents then the solution might be to just wait it out until you can do things on your own without having to get your parents' permission for everything and bothering your brother to come along with you all the time.
as much as you think you're getting better by coming to the occasional tournament, it's nothing compared to what you could be doing at a meet. basically what gords said in his post.
so ideally you would want to be going to meets.
so, if like in your case, you can't, and you see no way of getting around that, then there really isnt too much you can do until you can solve the actual problem. basically i'm saying that your short term goals such as trying to host tournaments isn't going to really much help you achieve your bigger, long term goal of getting better.
maybe you should work on trying to find a way to attend meets and other smaller more effective gatherings rather than jumping a few steps and going to big tourneys and stuff. i'm not discouraging you from going to bam for instance, but like i said, you can't really get better from just going to bam. going to bigger events doesn't mean that you'll get more out of it in terms of getting better at the game; it's in fact the opposite.
as for how you can try to get around your dilemma, well that's something you have to figure out yourself. we don't know a thing about your parents, or their reasons to not allow you to go to a person's house but would allow you to go to a venue(which personally i think is unreasonable; wouldn't it normally be the other way round?), so yeah, good luck with that.
tl;dr: you should for now forget about trying to organise events and focus your attention on the reasons behind your not being able to go to meets, then work your way up. if you're really serious about getting better then that shouldn't be a stretch at all.
also how old are you anyway?
the way you talk about your parents not letting you go to a "stranger's house" makes it sound like you're in primary school where you learned about stranger danger or some **** the other day.
obviously we're not your closest friends, but we're still part of the community that you chose to be a part of. how do you expect to participate if you're always so distant to it?