... uma festinha à tarde regada a chá.
We had an afternoon little tea party, (with a variety of tea types*, OR with plenty of tea**)
The first example (in brackests) would be "regado" with emphasis on the tea types (brands etc) and the second one, on the quantity of tea.
We had an afternoon little tea party, with plenty of tea and kinds of tea to satisfy all tastes; an assortment of finger sandwiches, as well accompaniments such honey, lemon, milk, sugar etc.
... eu (regado a um pouco de vinho, claro) enviei o prospecto ...
I (inspired by the drinking, of course)/I with that confidence that came from a bottle, of course) sent the prospect...yada yada yada...