Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Large Framed Grateful Dead Radio City 1980 NYC Halloween Poster 24" by 20"
Product description: This is a Poster Print in frame measuring 24" by 20". The frame is a high quality, glass-fronted, studio black design. The print itself is 17" by 11". This concert poster is VERY COLLECTABLE among fans! This will look great in any decor. It comes mounted and ready to hang on your wall! The Poster is new and in Mint condition. These are very hard to find and will continue to rise in value over the years. I have hundreds more available - all bands and types of music! Email me for any questions.
Product feature: Frame is 24" by 20", Frame is Studio Black with Glass Front, Actual Print is 17" x 11" Professionally Matted and Mounted, Hundreds of different prints available, Grateful Dead NYC Halloween 1980 Shows at Radio City Music Hall
Product price: $66.99
Product brand: Cleveland Vinyl
Target attributes: Special Occasion
Answer: attribute: special occasion
value: halloween
source: product feature
attribute: special occasion
value: halloween
source: product title