You will also need to provide housing for the umpires. Standard two to a room, plus a single for the UIC. Generally, this can be negotiated with the largest hotel where you house the teams.
Hospitality is also a factor; you can often get lower games rates if you provide meals for the umpire crew. Liquids during games is a minimum expectation; snacks and drinks between games is also a relative expectation.
If you are trying to build a reputation as a top tournament, 3 umpires per game is a good investment.
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Steve
ASA/ISF/NCAA/NFHS/PGF
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