House of Blues is set to celebrate 20 years with a Happy Anniversary Hour benefiting The Animal Foundation, 655 N. Mojave Road, sponsored by petching.com. The charity event is scheduled for 5 to 8 p.m. Saturday, Dec. 1 inside the Foundation Room at Mandalay Bay, 3950 Las Vegas Blvd. South. Attendees must be 21 or older. Admission is free with RSVP. For more information or to RSVP, visit here.