I know there have been lots of posts about tipping etiquette, but I have a sort of unique situation. We are having an open bar for cocktail hour at a private residence after the ceremony. We are hiring 2 bartenders for this cocktail hour (literally an hour). They are being paid $25 per hour for their service and we really don't want to have them put out a TIP jar. My question is, if they don't have a TIP jar, what should we tip them? These bartenders will also be the bartenders at our reception after the cocktail hour (at a restaurant, from which they were hired), where their fees and gratuity are included. We have to pay them separately for the cocktail hour.