I'm gonna wade in as the token Brit here, and give my cultural perspective....
Snakebite is cider mixed with lager. Anything goes as far as the ingredients are concerned, but many bars wont serve them. Frequently mixed with blackcurrant cordial to make a purple monster (which is wrong, and instantly identifies the drinker as a student).
Shandy is consumable at anytime of the year, and doesn't tend to have the 'summer' tag. Quite pleasant is a shandy made with and ale and a ginger beer (not American ginger ale) in place of the lemonade.
And...over here a Black Velvet is Guiness and champagne.