Note, this is not a Twitter pitch. You will need a query and 60 to 70 words of a completed, ready-to-submit manuscript. You will have two windows on March 1 to submit your material via a Google form, a link to which will be provided.
There's lots of information on this event at the link above. Check it all out.
I must add that networking about events like this is another benefit of belonging to a writers' group, particularly one with trained, active writers who are pursuing study and submission.