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Hosting the flagship San Diego Comic-Con, this convention centre in Downtown San Diego welcomes around 130,000 attendees each year, who flock there—often in fabulously elaborate costumes—to meet creators, experts, stars and other fans. It’s described as the biggest event of its kind in the world, with activity spilling not just through the Convention Center itself but across Downtown, creating a huge, city‑wide celebration for comic book and pop‑culture enthusiasts. - Liv Kelly