Celebrating a 30th birthday can be a fun milestone, and choosing a theme can make the event more memorable. Popular themes include retro, where guests dress in styles from the 1980s or 1990s, and black and gold, which adds a touch of elegance. Other ideas include a tropical luau for a relaxed vibe or a Hollywood glam theme for a night of glitz and glamour. Food and decorations can also reflect the chosen theme. For a retro party, consider serving nostalgic snacks and drinks, while a tropical luau might feature fruity cocktails and leis. Personal touches, like a photo booth with themed props, can enhance the celebration and create lasting memories.