Hi, congratulations for this initiative! But you need to clarify one detail: which city of Mexico are you referring to? See Groups#Local_groups: "Local groups must tend to be really local. Starting points like e.g. Recife, Munich or Saint Petersburg are better than Brazil, Germany or Russia."
We had this situation with "MediaWiki Group India", which ended up being "MediaWiki Group Ahmedabad" + a request for a mediawiki-india@ mailing list to the Wikimedia India chapter and some other potential groups that are being cooked up.
Let's discuss. Where are you based?