There's something special about a milestone birthday — and when two friends decide to celebrate turning 50 together, you know the night is going to be a good one. That's exactly what happened when I got the call to DJ Rachel Stern and Erika Meredith's joint 50th birthday party. Here's the fun part: Rachel and Erika built their own playlist. They knew exactly what they wanted the night to sound like, and my job was simple — take their vision and navigate the room with it, read