Modifiers matching holiday:

• religious,
• regional,
• major,
• sporting,
• individual,
• joyous,
• special,
• beautiful,
• local,
• festive,
• busy,
• irregular,
• secular,
• desirable,
• jewish,
• popular,
• biblical,
• big,
• important,
• liturgical,
• national,
• civil,
• strange,
• common,
• fixed,
• memorable,
• ecclesiastical,
• civic,
• key,
• christian,
• traditional,
• annual,
• official,
• personal,
• seasonal,
• floral,
• cultural,
• over,
• federal,
• active,
• romantic,
• basic,
• american,
• historical,
• catholic,

Simple categories matching irregular:

• surface,
• shape,
• space,
• program,
• body,
• set,
• behavior,
• object,
• organ,
• motion,
• polygon,
• ground,
• work,
• road,
• part,
• hours,
• material,
• item,
• activity,
• phenomenon,
• terrain,
• period,
• asterism,
• condition,
• expense,
• area,
• original,
• feature,
• line,
• particle,
• boundary,
• use,
• occurrence,
• system,
• event,
• solid,
• substrate,
• component,
• odor,
• interval,
• wall,
• dust,
• light,
• array,
• border,
• pattern,
• obstruction,
• payment,
• connection,
• edge,
• flower,
• profile,
• unit,
• structure,
• form,
• curve,
• display,
• holiday,
• soil,
• astigmatism,
• shelter,
• organization,
• cell,
• commodity,
• job,
• place,
• week,