Dressy casual.
If your invitation included a guest, then yes! Otherwise, we are trying to keep our group really intimate with just those we invited.
UPDATE!!! We have learned that Hukilau Beach parking lot will not be closing up in the evening, so there is plenty of parking there. It is directly next door to the Sheppard residence. It will be the closest and most convenient. On the chance that it happens to be full, there is parking at the temple, a 10 minute walk away.