One running away to get married

• Runaway bride, say
• A certain runaway
• Wedding march skipper
• Lover on the run
• Las Vegas groom, often
• Runaway bride or groom
• One who skips church, maybe
• Las Vegas bride, often
• Amorous runaway

Wiktionary Word definitions in Wiktionary
n. agent noun of elope; one who elopes.