[FlyWf]

When Chevrolet advertised a free car to anyone who bowled a 300 that day they were offering a unilateral contract to all bowlers on that day. Harris accepted their offer by performance of the required 300 game. If Chevrolet mistakenly aired the ad on a day they did not intend to run the offer their offer is still valid since mistake by only one party does not void a contract.

That's all assuming the ad ran on the day of his game and that the language was specifically "Today" or "This Bowling for Dollars tourney" or something like that.

If it was "Today, November 17th" or something Chevrolet will argue(and imo win) that their offer revoked itself at 11:59 on the 17th. If it's "Today!!!! Anyone who blah blah blah Offer not available to Chevrolet Excitement employees or professional bowlers. Offer expires November 17th. Void in California." you've got yourself a tricky situation.

Assuming you've accurately given us the fact pattern your teacher has done a [censored] job. The correct answer is essentially give the case to the jury since it's a question of fact, not law. The fact pattern implies that the ad ran during Harris' tourney but then Chevrolet claims that they hadn't ran the ad for a month, this case needs more facts.