It's genuinely a multi-day commitment
Where a U.S. wedding is often a single afternoon and evening, a Mallorca wedding weekend usually spans 4 to 7 days for close guests. That's a real ask, both in time off work and in travel cost, so invitations and save-the-dates should go out further ahead than U.S. norms, generally 9 to 12 months for international guests.
Gifts work differently
Given the cost of international travel, many couples explicitly note that guests' presence is the gift, sometimes with an optional registry or honeymoon fund mentioned quietly rather than expected. It's considered gracious, not presumptuous, to make this clear in the invitation suite.
The dinner schedule will surprise people
Spanish dining runs later than American guests expect, dinner reservations at 8:30 or 9pm are completely normal. Flag this clearly in your welcome materials so guests don't arrive at a restaurant an hour before it opens.