I mentioned “why not before,” in the post. Playing the B-side before the important game could end up using players that need to play with the first team if there’s a late scratch or a specific tactical substitution. Why tie the coaches hands ahead of time?Why not before? Sell more concessions. Ease the traffic in. Make it a whole day thing. Allow re-entry, give the local entrepreneurs a shot in the arm.
Maybe the field wouldn't be able to take it? No idea really.