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The solution to this is The One Ring. The ring referred to in The Hobbit renders the wearer invisible ("nothing to look at"). Other interpretations: the ring appears to be a plain gold band, and rings are circular like the number zero. Once someone possesses it, it is very hard for them to give it up ("delightful to hold"). The ring is golden, and contains an inscription describing its nature.

The solution to this is The One Ring. The ring referred to in The Hobbit renders the wearer invisible ("nothing to look at"). Other interpretations: the ring appears to be a plain gold band, and rings are circular like the number zero. Once someone possesses it, it is very hard for them to give it up ("delightful to hold"). The ring is golden, and contains an inscription describing its nature.

In the extra lines, the One Ring was forged long before the events described in The Hobbit but it appeared absolutely unblemished. The sound a bell makes is a ring. In the first book of Lord of the Rings Gandalf throws the ring into a fire (revealing the writing on it), yet it remains cool to the touch.

The solution to this is The One Ring. The ring referred to in The Hobbit renders the wearer invisible ("nothing to look at"). Once someone possesses it, it is very hard for them to give it up ("delightful to hold"). The ring is golden, and contains an inscription describing its nature.

The solution to this is Dark. The Dark Ages are a "tally of years". A "dark steed" a "dark horseman" and "dark beer" are common phrases. Dark humour might be the cause of "ho-hos" (laughs). One who "examines the calendar" may be overly preoccupied with death, a common subject of dark humour.

The solution to this is The One Ring. The ring referred to in The Hobbit renders the wearer invisible ("nothing to look at"). Other interpretations: the ring appears to be a plain gold band, and rings are circular like the number zero. Once someone possesses it, it is very hard for them to give it up ("delightful to hold"). The ring is golden, and contains an inscription describing its nature.

The solution to this is Dark. The Dark Ages are a "tally of years". A steed is a horse, hence "dark horse" a knight is a horseman so "dark knight" and "dark beer". Dark humour might be the cause of "ho-hos" (laughs). One who "examines the calendar" may be overly preoccupied with death, a common subject of dark humour. There may be a reference to "dark days" or perhaps OP is merely struggling with the difficulties of rhyme and meter. The solution is also hidden in: "calendar knows".

The solution to each of these riddles is also the solution to one of the riddles posed in the fifth chapter of J.R.R. Tolkien's The Hobbit, titled "Riddles in the Dark". There are a total of 10 "riddles" posed in that chapter. The only one that doesn't have a corresponding answer here is the following:

No-legs lay on one-leg, two legs sat near on three legs, four legs got some.
 The solution to this (rather unsatisfying) riddle is mentioned above. Please refer to the link above to see the rest of the riddles from the book.

The solution to each of these riddles is also the solution to one of the riddles posed in the fifth chapter of J.R.R. Tolkien's The Hobbit, titled "Riddles in the Dark". There are a total of 10 "riddles" posed in that chapter. The only one that doesn't have a corresponding answer here is the following:

No-legs lay on one-leg, two legs sat near on three legs, four legs got some.
 
The solution to this (rather unsatisfying) riddle is mentioned above. Please refer to the link above to see the rest of the riddles from the book.

We can also determine that the title of the puzzle likely stands for "Tricky Tolkien Tribute (or Humble Hobbit Homage)".