Around This Time of Year
by Kegler

Each clue contains an extra word, the first letters of which identify squares in the grid to be shaded.
When completed, the shaded squares (including the four already provided) contain a message.

Around This Time of Year grid

Across
1Was in charge of Baptist church's style of dressing (5)
4Pack one's blade carelessly in retreat (9)
9Shrewdly tactful X-ray snapshot captures old drunk (7)
10Thus far, father goes after attorney with drink (4,3)
11Frilly border surrounding St. Peter's impressive entrance, note, and cellar (4,5)
12Single virgin, while sexy, heartless and fresh (5)
13Eponymous Greek character takes in unendingly bleak picture (7)
16Top story: Telephone company eventually starting to improve average performance (5)
18Boy isn't running backwards near a vertex (5)
20Finds another purpose for keeping grainy blue picture puzzles (7)
23Close off heavy molded wall footing (5)
24Build up true belief about perfume, for the most part (9)
26Delightful aliens agilely dancing around club (7)
27Tract of nearby pasture left out (7)
28Kennedy's holding snare with first of distinctly odd four-footed creatures (9)
29Extract Western portion of secret nickel deposit underground (5)
Down
1Spread like cheap wine, once (6)
2Explicit lines in lively tunes – there's nothing to it? (4,3)
3In vile joint, a couple of turkeys ask for money (3,2)
4Again stage “Time Out”, young reporter's entertaining retrospective for Floridian NFLer (9)
5National prestige of troupe mentioned (5)
6Supports friends riding wild steed, obviously (9)
7Meet nightly behind silly dope's place (7)
8Per Rev. Spooner, taste England's sausage and pretend to sing (3-5)
14Actresses Lucille, Victoria and Moran with a dancer (9)
15Elongated shaded areas around wing covered ribs? (9)
17Nervous to the extreme, one rattled tenor cut siesta short (8)
19You'll make clear where de body is? (7)
21Embattled financial institution to back urban baseball diamond (7)
22Dingy, second-rate western hat (6)
24Cut to graphic section of a long poem (5)
25Cover one relative of a European raccoon (5)

Solution