How can I get into the volcano ceremony?

Hint 1 of 9:

Talk to Lemonhead.  He'll give you a big clue.

Hint 2 of 9:

There's a guest scheduled to arrive from another island.  See if you can
impersonate him.

Hint 3 of 9:

He is dressed for the ceremony.

Hint 4 of 9:

That is, he's dressed like the cannibals.

Hint 5 of 9:

What strikes you most about the cannibals?

Hint 6 of 9:

How about their masks?

Hint 7 of 9:

Make your own.