Launch Festival has free tickets and a couple of competitions
You can sign up here as well as get more information:
In addition they have several competitions depending on the state of your company. They also have "cheap" demo tables as well as more expensive exhibition space. You can apply for a scholarship for the demo tables.
I am not promoting or recommending this conference, but it may be of interest to both investors and entrepreneurs.
I did sign up for the free ticket and I'm contemplating the Launch 2.0 competition.