We are having a wedding on a Friday downtown... So traffic is a concern and are doing a happy hour from 45 ceremony will start at 5. We want to give our guests time to get there, mingle, grab wine/snack without rushing through traffic just to hang around for an hour without anything to do but also so people don't show up late bc they did hit traffic. Anyhow, we would like people to show up for most of happy hour, but we don't want it to seem like they have to be there at 4 on the dot. How would you word the invite so it doesn't seem either too formal or that they should just show up at 4:55?