PARK SLOPE If you came dressed up to our Mad Men finale party, you already have a costume for Sheep Station‘s Mad Men Halloween bash. (And if you need inspiration, check out the fabulous outfits in these party pics.) The suggested $5-$10 donation gets you your first drink free, and benefits the microlending program WomenForWomen.org. Doors 7:30, costume contest at 10. May the best Joan win.