At most, one destination event
More and more couples are choosing travel for their weddings as well as their bachelor(ette) parties. All-in, these trips can run thousands of dollars each of your friends. If you are going to ask that your closest friends travel to celebrate, keep it to one destination event. If you have a destination wedding, do your bachelor(ette) parties locally. Also, consider your out-of-town friends will need to travel for everything. Do everything you can to be mindful of the impact on them.