Crowd Control solution
by Kegler

20 Across, LITTLE BO PEEP, has lost her sheep; specifically, three RAMs, three EWEs and two LAMBs disappear before entry.

Crowd Control solution grid

Across
1M(A + CA)-W
5TA + B(L)EAU
10IMP + LORE
11RENE + WED
12SILO (OILS anag)
13RE(L + I)EF
14SLA(MBA)NG
15HA(SS)LE
16AN + THEM
19LADy
20LITTLE BO PEEP
23RAH (even letters)
26SCAR(C)E
28A + W(A)ITS
31MEAD (DAME anag)
32VAL + I'(U)M
33DAM + P
34SIG + N (GIS rev)
35W + ISEMEN (NEMESIs rev)
36RAMS(HACK)LE (REALMS anag)
37T + RUST
Down
1MISS + A + L
2A + M + MAN
3A(LIGHT)S
4WOLF + RAM (rev)
5T(R)OT
6B(RE)AD
7ENISLE (SENILE anag)
8ADELA (hidden)
9UNFRAMED (FUN DREAM anag)
15HUBS (BUSH anag)
17METS (rev)
18SPA(MME)R
21T(HAL)IA
22PE(DAN)T
23REWEAVES (hidden)
24AWASH (rev hidden)
25S(TUN)K (rev)
27CLAMBAKES (MALES BACK anag)
29ODIE (hidden)
30MAEWEST (WET SEAM anag)