Participating in dev events won't guarantee you getting a job, no matter your experience. I see it more as sowing seeds, which as you build up your network, someday you'll be able to harvest. So rather than coming here just to participate events, it would be something I'd do if you had plans to come here otherwise (such as visiting family).
One way to get more value out of events is to speak at them. Smaller regular events, like the one I hold, Tokyo Rubyist Meetup, are always looking for speakers. Even if you don't have something deeply technical to talk about, I think you'd still be welcome.
Another path would be to try and work for a Japanese company with offices in the Philippines. Gengo and Rarejob are two startups I know of that are headquartered in Japan, but have development offices in the Philippines. While working for them might not directly lead you to Japan, it would be a step in the right direction.