It is a bit hidden but the information is indeed part of the cfp 
Travel assistance
Travel assistance (in form of reimbursement of costs for flight and housing) and/or a reduced conference ticket is available for a limited number of speakers, particularly those who bring new perspectives and diverse backgrounds to JuliaCon. Details will be send out after the call for proposals closes.
Since we are a non-profit conference we sadly can’t pay every speaker their conference tickets.
We have funds available (due to some amazing sponsors) to cover conference tickets and travel costs for a subset of speakers and we will have a call towards the end of the CfP where you can apply for that.