At small FLL tournaments (10-20 teams) that I help organized, we get
the vendor machine size snacks and soft drinks (water for the adults). Individually wrapped pretzels, chocolate, cookies and trail mix are top items from COSTCO, SAM's Club or BJ'S.
This eliminates the need for a lunch break and the events are usually wrap-up by 12-1PM.
Lollipops are very popular with everyone; especially the referees and crowd control people. They are the best thing to keep the troops working.
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