It's the perfect time of year to visit San Diego, so we recommend staying for 5-7 days. Make a vacation out of it. You're already here, so make the most of it; there's plenty to do.
For the actual event, semi-formal: cocktail dresses and jumpsuits, dark suits and ties, etc. Just look nice. We know you can do it.
We're fairly confident that you'll love the weather. Expect upper 70s during the day and mid-60s at night. Being right on the ocean, expect the incoming breeze to be a bit chillier than you're expecting. T-shirts and shorts are comfortable during the day, but we recommend bringing a jacket for later outings, just in case. Sunscreen and sunglasses are basically mandatory.
For some more specific tourist recommendations, see the "Things To Do" page on the site.
Though your presence is present enough, if you wish to bring a small gift, there will be a gift table at the front entrance of the venue.
The venue is an air-conditioned warehouse with an outdoor cocktail area, so please feel free to move indoors or outdoors to make yourself comfortable.