K.K. Slider comes to The Roost in the museum every Saturday between 8pm & 12am. Request one of the songs below:
K.K. Technopop
K.K. Safari
Café K.K.
K.K. Love Song
Two Days Ago
Only Me
Surfin' K.K.
Rockin' K.K.
K.K. Lullaby
K.K. Mambo
K.K. March
K.K. Folk
K.K. Faire
K.K. Country
K.K. Bossa
Mr K.K.
Señor K.K.
K.K. Ragtime
K.K. Samba
K.K. Swing
Lucky K.K.
Imperial K.K.
K.K. Calypso
K.K. Cruisin'
K.K. Lament
K.K. Parade
K.K. Salsa
K.K. Steppe
K.K. Western
Aloha K.K.
I Love You
Comrade K.K.
K.K. Aria
K.K. Casbah
K.K. D & B
K.K. Fusion
K.K. Reggae
K.K. Ska
K.K. Tango
K.K. Soul
K.K. Waltz
Go K.K. Rider!
K.K. Blues
K.K. Condor
K.K. Etude
K.K. Jazz
DJ K.K.
K.K. Ballad
K.K. Chorale
K.K. Dirge
K.K. Gumbo
K.K. Rock
K.K. Song

Jingle comes between 8pm on December 24th and 1am December 25th. Change your clothes everytime you talk to him to get more items because he won’t recognize you. His items are:
Festive Paper
Jingle Bed
Jingle Carpet
Jingle Chair
Jingle Clock
Jingle Dresser
Jingle Lamp
Jingle Piano
Jingle Shelves
Jingle Shirt

Jack visits every Halloween between 6pm and 1am (on Nov 1st) but everyone is dressed like him. There is only one real Jack. Talk to him to get a spooky themed item. Walk away then find him somewhere else to get more free items. You might be able to get the whole set! His items are:
Spooky Bed
Spooky Bookcase
Spooky Carpet
Spooky Chair
Spooky Clock
Spooky Dresser
Spooky Lamp
Spooky Sofa
Spooky Table
Spooky Vanity

Gulliver comes between 6am and Midnight on random days every week and can be found on the shores of your beaches. If you talk to him and listen to his stories every week he will give you a rare item that can't be bought anywhere! So check your shores everyday once a week and he will give you a rare item. The items he'll give you are:
Arc de Triomphe
Chinese Lion
Chinese Lioness
Chocolates
Compass
Fishing Bear
Lady Liberty
Manekin Pis
Matryoshka
Merlion
Mermaid Statue
Metroid Moai
Statue Moai
Statue Mouth of Truth
Pagoda
Plate Armor
Shogi Piece
Stone Coin
Tiger Bobblehead
Tokyo Tower
Tower of Pisa
Tribal Mask

Hope I helped someone! :)