The past two editions of the Dutch PHP Conference were a big success, and now it's time to be part of that success! So start writing that proposal on the topic you know everything of, and submit it for consideration for the Dutch PHP Conference.
If you're a bit unsure of how to write a proposal, my colleague Lorna wrote a great article on "How to Submit a Conference Talk", which may help you along. In case you're still not sure, feel free to contact me, I'd be happy to help you out!
So, no excuses now, start writing those proposals and send them in!