Leaving newborn for a whole weekend?

Pros and cons of leaving my kids with their dad for a whole weekend? My brother and sister and law are getting married next month. Next weekend they're having a combined bachelor/bachelorette party at a cabin a few hours from here. The only issue is I would have to leave my daughter home with my husband all weekend. My oldest is 18 months old and my other daughter will be a month next Friday the 16th. She is mostly breastfed but does great on bottles too and I've got about 200 ounces frozen right now. My husband is pushing for me to go and have fun but I'm just not sure if it would be okay to leave my youngest all weekend? My oldest has been away from me overnight before and she does great but also her daddy is her favorite person in the world so I know she'd be totally fine I'm just worried about leaving my youngest that long.