Aquaman #18

Few comics can claim a wedding this well-attended — Aquaman #18 (December 1964) features Nick Cardy's joyful cover depicting Aquaman and the red-haired Mera being pronounced man and wife beneath the domed splendor of Atlantis, as an officiating elder joins their hands. Crowded into the ceremony as honored guests are a remarkable assembly of DC heroes including Batman, Wonder Woman, Robin, the Flash, and several others in full costume, bubbles drifting around them in the undersea setting. It's a genuinely warm snapshot of the Silver Age DC universe gathered together, and Cardy's clean, expressive linework makes the whole scene feel like a celebration you'd genuinely want to attend.