Oh right, that's why it's not working. So if we all take drugs on the streets then the law will change. Will try this weekend and report back, assuming that I won't be in jail for the next 5-10 years.
Aside from that: I wonder what would happen if all the people in the country who are using marijuana at least semi-regularly were to go to some very public place at the same time and light up a joint.
That obviousness surely elevates their response to DH4.
Instead of a posting a glib response, a reasonable thing to do would be to read the wikipedia article on civil disobedience and realize that a single person randomly disobeying a law in public is not how it works.
We are on the internet. Most of these conversations will go nowhere beyond where the people reading them will take them, which is nowhere. I am not interested in writing essay after essay debating things with people who have no power to change them in the first place. This is a waste of time. The internet primarily exists as a form of entertainment. This may be against the spirit of HN but I would argue that HN is against the spirit of the internet. My proof of this is that the vast majority (99%+) of the internet is nothing like HN.
Anyway, to address your point - numerous people take drugs publically at events like music festivals. The result of this action is a lack of arrests and a lack of policy change.
What you would want to do are:
1) Bring the issue to the public. Make sure that it ends up on the evening news more often than not.
2) Dispel most of the myths associated with drugs (e.g. all drug users are out-of-control crazed lunatics on a homicidal rampage to kill you and your kids!).
3) Get more people on-board. If more and more and more people are getting arrested very publicly for using drugs, then at some point, the government will have to do something, because they can't afford to have a significant portion of the population in jail.
These are the end-goals. Mostly to change public perception and to get the majority of the population on your side. Then you want to bring the issue to a head.