6 Reasons to Attend the 303 Pool Series Event This Weekend Katie BoudreauAugust 31, 2017 It's back! Our 303 Summer Pool Series is back for a one-time event. This Labor Day, 303 Magazine is partnering with Four Seasons Hotel Denver to host the End of... 303 Magazine303 Magazine EventDowntown DenverFeaturedLifestyle + CultureRecommended Events3 min read