TASK DEFINITION: Given the Question and Answer pair, detect whether the answer is acceptable or not. Denote acceptable answer as "yes", otherwise denote as "no". An acceptable answer is consistent with the context in question, detailed, long, and uses general knowledge of English. Answers that are not definite and suggest a variety of options are not acceptable answers.
PROBLEM: Question: Is it correct to say "Wish you a happy weekend" or should I say "Wishing you a happy weekend"? 
Answer: Neither Wishing you a happy weekend nor Wish you a happy weekend would be used in normal conversation. As others have noted, spoken parting platitudes at the end of a week are normally started with have, such as: Have a good weekend Have a nice weekend etc. Change the adjective to be what you think most appropriate for the situation. On the other hand, if you are signing off some correspondence, such as an email, then Wishing you a happy weekend is more appropriate. Similar constructions include Wishing you a happy birthday Wishing you a merry Christmas Wishing you well To use *Wish you a happy weekend you need to add I to make the sentence grammatical. i.e. I wish you a happy weekend. A notable exception to this is the common postcard sign off Wish you were here where it is idiomatic to leave out the I.

SOLUTION: yes

PROBLEM: Question: I need to find a shortened format (abbreviation) for the words "look at" (to be used when referring people to another website). For example: Example given e.g 
Answer: The latinate abbreviation (corresponding to "e.g." for exempli gratia) is "q.v." for quod vide = "which see", to direct someone elsewhere for further information. If it's an abbreviation you want, that's the perfect fit. As other answers point out, however, "see" is even shorter, and provides more clarity. While "q.v." is common enough in some academic writing, it's not exactly common parlance. My own sense is that "cf." should not be used here (even though it is in the "accepted" answer): it has a real meaning, and that meaning is "compare". From the question, that isn't the intended meaning. It is properly used in situations to contrast one thing with another (see also the advice from the the APA blog on the use of "cf.").

SOLUTION: no

PROBLEM: Question: This year there were: many more people much more people Alternatively: many fewer people much fewer people Which is considered better English? 
Answer: According to Google Books Ngram Viewer, COCA, Ludwig and storywrangler, "many more people" is much more frequently used than "much more people". A search on the NOW corpus shows that "many more" modifies countable nouns while "much more" is followed by uncountable nouns in most cases. Grammatical rules do not work here. In "many more people", "many" pretends to function as an adverb, but in fact it is still an adjective. Keep in mind that language is not science. If many people use "many more people ", it will be grammatically correct eventually.

SOLUTION:
no