At the end of 2015 (and beginning of 2016) Michael Cullum put together a series of tweets with suggestions to help potential conference/event speakers out there in submitting to Call for Papers. He's gathered them together and posted them to his site to make them easier to find all in one place.
On the 25th December I started a series of tweets under the hashtag #12DaysOfCfpTips. For those who are unaware, I’m one of the organisers for the PHP South Coast Conference (P.S. Blind bird tickets are up wink), and within the organising team I’m responsible for the Call for Papers and everything speaker-related in general and getting better submissions are both in the best interest of a conference organiser and the submitter.
A few people had asked me to post them up somewhere more permanent and perhaps expand on them beyond 140 characters a little so here we are with a roundup. The tweets are in chronological order.
His list includes suggestions about providing "extra" information on your submissions, looking at the suggested talk topics and mentioning any previous speaking experience. There's also links to each tweet so you can see any conversation that might have happened around them (often including some additional advice as well).