Baking day fiascos anyone else struggling

My family does a cookie baking day every year since I was a young child. This year I tried to host it as I have the only home big enough and wheelchair accessible for family. I also have a two month old who just had shots, toddler, and a kiddo. I haven't slept. I tried to bake my stuff before everyone came but in the chaos I forgot the baking powder in my pound cakes.

Everyone showed up early. Started bringing in boxes of stuff. There was no room for. At the same time my baby was screaming and I forgot pads in my bra so I started leaking so much milk I was dripping down my bra shirt and jeans. My kids were fighting.

I burnt the next batch and was still trying to find a place for everyone's stuff.

I started having a melt down. I snapped at my kids for bringing toys into the kitchen when I told them no. Then they were outside in the snow without shoes or socks. I was trying to console my baby when I was being asked a million questions. I opened a door to put stuff on the porch and my cousin bent down at the same time and the door hit her while I was carrying the baby and a bunch of stuff.

Cousin then left as I tried apologizing and she left mad. My mom was upset I wasn't in a good mood. I was trying so hard. But to have all these adults who are elderly and not able bodied and me and my kids I got overwhelmed. They brought their entire kitchens to my home. They don't normally bring that much but they assumed I would have space I didn't. I had tables blocking doors and those in wheelchairs couldn't get around and then there was me with a crying baby.

Everyone left without baking and it was a shit show. A few are coming back tomorrow to bake when my husband can watch the kids. I just am burned out. I'm trying so hard to create memories for my kids and no one else has kids my cousin is an only child. I'm legit the only mom with kids and multiple. I was so looking forward to today took two days to prep. I screwed it up by everyone's expectations of me and I'm upset. I can't regulate my emotions enough and I set the tone for a terrible time.