Belladonna Nightshade Press has posted an anthology call for "Not Today". They're seeking stories of 2000 to 10,000 words in which "characters survive to carry on, even if they may have lost something along the way". They're open to all genres. This is a charity anthology and proceeds will go to UNICEF. The deadline is June 1, 2018. You can find the details here.
And again, thanks to Michael Bracken for the link!