Modifiers matching outing:

• enjoyable,
• quarterly,
• regular,
• inexpensive,
• social,
• frequent,
• corporate,
• optional,
• educational,
• planned,
• simple,
• urban,
• recreational,
• special,
• monthly,
• organized,
• active,
• seasonal,
• expensive,
• casual,
• communal,

Simple categories matching optional:

• excursion,
• activity,
• offering,
• filter,
• extra,
• medium,
• equipment,
• card,
• data,
• facility,
• item,
• unit,
• field,
• subject,
• tool,
• system,
• filler,
• device,
• attribute,
• service,
• thing,
• package,
• property,
• module,
• feature,
• outing,
• ingredient,
• sport,
• information,
• stuff,
• event,
• accessory,
• component,
• choice,
• place,
• expense,
• lense,
• document,
• travel,
• tour,
• material,
• hardware,
• part,
• comment,
• coating,
• peripheral,
• training,