Absolutely!! Please just reflect your total number in your RSVP.
Definitely - just please reflect your total number in your RSVP so we can feed your date too!
About 20 minutes - don't worry, we won't make you wait for lunch!
Whatever makes you comfortable. If you want more direction, think cocktail or garden (Google it...) attire.
Please RSVP via the Evite invitation you received.