Travel is great for making memories. Just focus on what the bride or groom likes to do—whether that's a long weekend of museum-hopping in their favorite city or a few days by the beach. They're becoming less about ‘we can party as hard as we can’ and more about taking the time to enjoy each other's company.

Ultimately, these bonding moments should reflect the groom or bride’s defined preferences. With the personalization of weddings, the pre-wedding events are much of the same. Even bar crawls are becoming more focused around people's specific interests—like hitting the Bourbon Trail in Louisville. Something even as simple as a pool party, that lets everyone have fun—and ideally, not spend tons of money—also seems to becoming more the norm. But really, the only bachelor or bachelorette party trend you should worry about is what's trending with the groom or bride. What do they want to do with their friends before plunging into marriage?