As a cradle Catholic, I like to think that I have some understanding of ceremony and tradition.
I like the joinee at the head of the table. Perhaps each person could add to the plate as it went by to symbolize that we each bring something important to Pastafarianism. Two people bring the pot of pasta to the table, where a third plates it, a fourth adds the sauce, a fifth sprinkles parmesan and the celebrant adds the meatballs.
I am definitely in favor of spaghetti (he would have trouble reaching out to us with farfalle), but in the interest of inclusiveness, I would permit the joinee to elect an alternate pasta that has particular meaning to the joinee.
The joinee would then serve all the participants from the serving bowl, signifying giving back and community. This could be accompanied by the ritual breaking of garlic bread and a statement of belief by the joinee, offered as a toast (probably red wine).
More sedate chapters might want to finish the meal and then hear from a pirate celebrant, again in the form of toasts, this time with rum (Planter's Punch, Mojito or Grog) to be followed by cigars.
Alternatively, you might go with kegs of ale, wenching and midgit tossing...a raucous caucus.
Remember, as Vatican II recognized (and we would hate to be less forward-thinking than the ring-kissing, fish-eating Papists) it is not the form of the ceremony, but its content that is of primary concern.
Not a scientist, just a humble instrument of science.