Halloween Foam Party brings a family-friendly foam party to POST Houston Skylawn, the rooftop park at POST in downtown Houston. Multiple purple and orange foam machines fill the space with bubbly foam, and family-friendly music keeps the vibe fun. Prizes are given away for best costumes, so dress up and show off your spookiest look. It's an all-ages event for kids and families who want a playful, foam-filled Halloween celebration, and it goes on rain or shine.