This is on the assignor and he or she should have made this right.

At least in my experience, the visiting school has no say in who is on the game, even if they are in the same group. The only people that have a say are the assignor and the home school as they are the paying school for the event. And if the assignor screwed up and assigned you somewhere, he/she should be giving you another game at another site, which I have had happen many times for various reasons over the years.

Peace

This is in Missouri.

MSHSAA Athletic By-Law 6.1.1 requires that officials shall be agreed upon by both schools at least 30 days before
each contest. The home school shall engage the officials by contract offered by the principal, superintendent, or
athletic director delegated such authority by the principal. Such contracts shall be binding upon both parties and in
any case of a broken contract, the amount of the guarantee shall be paid by the offending party to the offended
party, except when a contract is broken because of reasons beyond the control of either party or by mutual consent
of both parties. Officials assigned through an official's association shall not be permitted to officiate unless
approved by both schools in accord with this By-Law. All officials are required to have contracts for the games they
are to work.

In reality only two or so schools I've called for actually send out a contract. We use arbiter in my association.