What are some yummy treats I could bring to a charity Christmas Tea?

I'd have to say the Barefoot Contessa's Maple Oatmeal Scones. I've made them about 50 times and they are consistantly the best ever. Fairly healthy (if you use steel cut oats and don't count the butter). They are still soft after days sitting on the counter wrapped in plastic and also freeze wonderfully. The recipe makes a lot if you have them only about 3/4" high so you'd have some for your family too.

Off the top of my head recipes I have tasted at Food52 gatherings in the past couple of months that are unforgettable and delicious
are http://www.food52.com/recipes/14717_coconutlemon_macaroons by Syronai.

Hardlikearmour has pickled prunes that are amazing - I would never have thought of that recipe and tasting it was such a treat http://www.food52.com/recipes/9268_pickled_prunes

Thirdchild has an olive recipe that is incredible and I especially love them because they are baked http://www.food52.com/recipes/15003_olives_in_a_nest

The Blue Cheese and Fig Savouries (a winner for Best Holiday Open House Dish) are outstanding, and different -- but delicious!! http://www.food52.com/recipes/8010_fig_and_blue_cheese_savouries Try to use a blue cheese that doesn't have much actual "blue" in it, though, because a lot of blue + yellow butter = green cookies. Tasty green cookies, but not as pretty as the ones in the photograph! ;o)

Gingerbread whoopie pies, like Acheson's Atlanta outpost, coconut macaroons, curried egg salad sandwiches, salmon croquettes, pickled cucumber + carrot sandwiches, shrimp salad sandwiches. On this webiste - Merrill's cream cheese cookies, Ms. T's pine but brittle, chaat masala spiced nuts, Antonia James' dukkah devilled eggs, pimento cheese biscuits, pumpkin cupcakes with goat cheese frosting.

A nice cracker with cream cheese or goat cheese and a dollop of hot pepper jelly. Most pepper jellies come in festive red or green. The cheese cuts the heat. Very tasty - make extra.

Spiced walnuts/pecans. Simple to make, a bit unusual, and always a hit.

There are so many great recipes for party food on this site that it's difficult to narrow it down. Here's an article A&M wrote about snacks for an Oscar party: http://food52.com/blog/1727_oscar_party

and from 2010: http://food52.com/blog/538_oscar_night_refreshments