Tell them Max Stoiber is speaking 😉
Just kidding of course. The best way to convince your company to send you to a conference is to be accepted to speak, that's free PR for them! (and a great way to hire new developers)
Submit CFPs to all the conferences you think are awesome, even (or especially) if you don't think you have anything to say, and believe me, many will accept you. See http://weareallaweso.me for some tips about CFPs and public speaking, and mxstbr.blog/2016/12/a-dream-come-true if you don't believe that I know what I'm talking about.