I was under the impression that it was proper etiquette to have an open bar for guests. They are traveling, celebrating and bringing a gift. I was under the impression that the least we could do is provide the food and alcohol. But after attending a cash bar wedding this weekend, many people said a cash bar is expected and an open bar is a nice surprise. However, a majority of the guests were older. All of my younger friends agree that it should be open bar. I was planning for the expense of an open bar, but if it's not standard that maybe it's something to reconsider. I've also heard that doing an open bar for the cocktail hour and then switching to cash bar is an idea. I'm not a fan of drink tickets.