Hi, I would make a few changes to Alan's revision: The company's show in 2013 was much better than the one in 2012; this emphasizes the significant progress the company made in 2012. My concern is the use of "get-together"? It does not mean the same as "show". Thus, the suggested revision.

The grammatically correct form is The get-together in 2013 was a lot better than the show in 2012, which also signified the great progress that the company (had) made during 2012. But the use of a clause starting with "which" sounds a little bit unnatural in this sentence. I would rewrite the sentence as follows: The get-together in 2013 was a lot better than the show in 2012; this also signified the great progress that the company had made during 2012.

"a lot more better" is wrong. good - better - best