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You'd capitalize "beach party" if the entire phrase is a proper name, because it's an official event: You are invited to the WidgetCo Christmas Beach Party! This is being held across the street...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/17565 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/17565 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
You'd capitalize "beach party" if the entire phrase is a proper name, because it's an official event: > You are invited to the WidgetCo Christmas Beach Party! This is being held across the street from the restaurant where we had last year's WidgetCo Christmas Karaoke Night and down the block from the inaugural WidgetCo Christmas Weenie Roast. If you're just talking about a general event which doesn't have a formal name, keep it lowercase: > You are invited to the WidgetCo Christmas beach party! This is being held at the same place as last year's WidgetCo Halloween beach party, two sandbars over from the inaugural WidgetCo Arbor Day beach party.