The best time of year to host an event in Las Vegas is any time you want! Las Vegas is a year-round destination, and there are lots of fun things to do here all year long. If you're planning on hosting an outdoor event, spring and summer are the perfect times to do it. The weather is great and there's plenty of daylight. Fall is another great time of year for outdoor events because the weather is still warm but the crowds have thinned out from summertime highs. On the other hand, if you're looking to host an event during the winter months (November-February), you'll likely find that many vendors are less expensive because they're not as busy during this time of year.