Girl Talk, Matt & Kim, Cold War Kids and Matisyahu have joined the lineup for this summer’s Catalpa Festival. The two-day event will take place at New York’s Randall’s Island on July 28 and 29. Other recent artist additions include: Hercules And Love Affair, Matisyahu, The Sheepdogs and Hook N’ Sling. The fest’s previously confirmed acts range from The Black Keys, TV On The Radio and Umphreys McGee to AraabMUZIK and Snoop Dogg (performing his Doggystyle album with special guests). Umphrey’s McGee will play two sets during the weekend, and Relix is also giving fans a chance to win backstage passes. Another round of acts will be added on May 21.