Give this a shot on Sunday....
In looking at my notes, all but one of the freqs for Communications Direct NASCAR Street Race Cap+ systems (WSDK913) match what has been used for Lollapalooza since 2018:
450 System -
LCN1 451.4375 CC8
LCN2 451.5375 CC9
LCN3 451.6375 CC10
LCN4 451.9625 CC11
LCN5 452.1375 CC12
LCN6 452.2875 CC13
LCN7 452.4875 CC14
LCN8 452.6875 CC15
460 System -
LCN1 464.8875 CC3 (has been 464.900 previously)
LCN2 463.925 CC5
LCN3 464.600 CC7
LCN4 464.325 CC9