I happen to live in a neighborhood of Brooklyn with both extensive Kosher
and Halal options (which is probably not a coincidence, since there is
significant overlap in rules).  But Mexico City has a different cultural
mix than New York City or London.

I can understand, though, that it may be too expensive and difficult to get
Kosher or Halal meat, or indeed fully catered meals, for Wikimania in
Mexico City.

Bur I would suggest going to a supermarket and getting something like a
pre-packaged hummus with K and H marks, and some plain fruits and
vegetables, so folks like this can at least have snack options during the
conference sessions, and that can tide them over if they want to go out for
a full meal fulfilling their dietary preferences later.

Thanks,
Richard
(User:Pharos)