Pi Day Town is less experienced with celebratory processions than, say, Thanksgiving Town; they just have one long marching band. It wanders off-course a lot, and for some reason, the performers encourage the audience to clap on the ones and threes.
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Rows

1.aPlan
bPlan
2.aDerbies, e.g.
bOld Olds
3.aChubby’s real name
bKind of reasoning
4.aShort-billed auk
bThe Walking Dead dedicated an episode to him
5.aCourt case?
bSteed player
6.aSupply center in Diplomacy
bNegligent
7.aRenaissance poet?
bBirthplace of Band 4
8.aSharp stuff, sometimes
b18th-century religious leader
9.aPanelist who often sat between Fred and Bennett
bMore obstreperous
10.aRival of Mars
bTV series set in the 1860s
11.aCatches
bSave
12.aEponymous album of 2013
bBeatty role
13.aIt might keep you awake
bThey catch waves

Band

1.G&S song feature
2.Company that originally produced playing cards
3.Pulitzer-winning lyricist
4.She was in the White House for four years
5.Historic House electee of 2018
6.Golden ___
7.Sadist
8.Where a rook starts
9.Cross words
10.White-bread spread?
11.Possible gig this band might have in 8 to 42 days
12.It follows CREATE TABLE
13.Current concern
14.Gave a whack
15.Go (to)
16.Subtitle of a 1978 horror movie
17.Ruled
18.Plaid source
19.Pantry items
20.For real
21.DNA source
22.How stupid things are often done
23.Blessed event?
24.Character on Lost or Heroes
25.Claim
26.It’s in many dips
27.It’s a real stunner