Mystery Convention Malice Domestic has posted an anthology call for "Murder Most Conventional" to be presented at their 2016 convention. They're looking for mystery stories of 3500 to 5000 words with a convention setting. The deadline is May 1, 2015, there's no mention of payment. You can find the details here, this link opens a pdf file.
PAYMENT UPDATE: January 9, 2015
"All royalties earned from sales of Malice Domestic 11: Murder Most Conventional
will be used for the Malice Angels Project. Each year, the Malice Angels Project
provides comprehensive registration for up to two individuals who are in need of
assistance to attend Malice Domestic. No remuneration will be paid to authors for
stories selected for inclusion in the anthology."