Uninvolved, noninvolved, excluded, blameless, exonerated
Yes, it is one word, eyewitness, for a person who directly observes an event.
One proper name is the town of Bethlehem. One word not directly related to Christmas would be "messianic".
There is no commercial type of such a plant which has a sale value attached, it would be entirely a one off experimental piece of equipment so only those directly involved would know this.
There are many ways that one can get involved with the HDA or Housing Development Agency. This includes contacting the Housing Development Agency directly or through a representative.
Mob, rioters
participant
One example would be: The president involved himself in the international affair. International can be the adjective in this particular case. I am wonderful, I know.
One art involved with handwriting is called calligraphy.
One factor not involved in soil formation is the movement of tectonic plates. Tectonic plate movement affects landforms and topography, but it does not directly contribute to the creation of soil.
Answerreallyreallyreallyreallyawsomlyawsomesauce.
The word 'would' has one syllable.
To speak directly with members of One Direction, I would suggesting contacting them through their official Twitters (a quick search will lead you to their twitters). You can also visit their official webpage: onedirectionmusic.com where there are opportunities to be involved with contests, discussions ect. with other fans.