We are having an outdoor ceremony at my dad's farm, and we are going to host a cocktail hour there as well because of time constraints at our reception venue. We plan to rent a tent for the cocktail hour which can be used as a back up plan for the whole ceremony in the event of rain. My issue is this - originally we had looked into renting a floor for the tent as well to make guests comfortable, but it is so expensive that I'm not sure I can justify it for one hour of the night. Is it acceptable to alert guests that this is going to be a rustic outdoor venue or do I have to bite the bullet and get the flooring?