An important part of being a great hostess is understanding what it's like to be a great guest. The first step towards becoming an excellent guest is knowing when to arrive at the party. When hosting a dinner or an event, there is nothing I hate more than people whom show up early unannounced. Invitations are sent with a specific starting time for a reason and if your hostess is anything like myself she is running around adding finishing touches to her sauces, plating bite sized appetizers, polishing wine glasses, and lighting candles. (My aunt came 30 minutes early for a dinner once and the appetizers were still in the oven, I wasn't dressed and had curlers in my hair-you can imagine my complete and total mortification). Coming before the space and hostess is transformed into party ready is a complete and total no-no. Just don't do it. Unless personally asked by the hostess, do not come early and if for some crazy reason you end up getting off the freeway twenty minutes before the specified time call her to let her know there was no traffic and you will be arriving early so she can at least put on her party outfit and set out a bowl of olives.