It took Frodo some time to locate the place, sadly. He wasn't chosen as the Ringbearer for his navigational skills nor his excellent memory, but he has persistence enough to keep searching until he finally overhears his cousin's voice from inside.

Grinning from ear to ear, he quickly hops in and claps Bilbo on his shoulder while nodding at Thorin. "What's this? A drinking fest and I wasn't invited?"