A jovial host.
An energetic guest at a party who makes everyone laugh is an example of someone who is jovial.
Origin of jovial
- French from Middle French under the favorable astrological influence of the planet Jupiter, jovial from Old Italian from Late Latin Ioviālis of Jupiter from Latin Iuppiter Iov- Jupiter dyeu- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition