Flash and short story submission market -- Fireside,  https://firesidefiction.com/about/#submissions-guidelines. They have short windows for sending submissions. Here are the dates (taken from their website).
Here’s our schedule for the remainder of the year (subject to change):

• September 17-23
• November 5-11

An essay contest with a prize of $3,000 detailing the happiest moment of your life.  https://www.realsimple.com/magazine-more/inside-website/contests-sweepstakes/good-read-contest

A call for an anthology - http://motherofinvention.twelfthplanetpress.com/submission-guidelines/