I am usually quite sharp but I don't know what happened today. I blame it on sleep deprivation.
So baby was playing up us usual last night. Around 7am I asked for DH if he could take DS away so i can rest a bit. Now, DH has been sleeping on the couch the last couple of weeks so he can get some sleep, but this morning he announced that he has been up most of the night and he wants to sleep. Fine, i took baby away and went to the living room.
Around noon I got a notification on my phone from an app i have saying something about mother's day deals. Then it hit me. IT'S SUNDAY TODAY! OMG it's mother's Day! Fuck that, I should be the one having a lying in not him!
Dog was been annoying this morning and baby was grumpy. So off i went to the bedroom with baby in my arms.
DH woke up when i entered, so i informed him it was mother's day and that he had obviously completely forgotten! I did get an 'oh shit, i am sorry, love' reaction from him and he promised to go and buy me something which actually pissed me off and i explained that all i had wanted was some extra sleep in the morning and maybe some nice breakfast. Obviously too late for either! I was in a grumpy mood after that.
Fast forward a couple of hours later, DH was looking very guilty and i was browsing on the internet when i noticed an upcoming event and the words ' Don't forget to book your place for an early Mother's Day celebration for this Thursday'. I had a very 'huh??' moment. I had to re-read that sentence a couple more times and after a quick Google search i realized my stupid, very stupid mistake.... Needless to say i wished for the earth to open and swallow me whole. 
I had even looked on MN prior to my 'huh?' moment and i couldn't find any mother's day thread and i kept wondering what has happened! I remembered last year AIBU was full of them!
I confessed my very honest ok not mistake to DH. He took it very well. Made me feel even more ashamed by how well he took it considering i was being a brat.
To be fair...IF it had been mother's day today i would have probably had some sympathy instead of the flaming i will probably get after i press the post button...