No necessarily, there are a few outdoor festival s here in AZ. They cover multiple genres. The 2 biggest are the Country and Rock festivals. I’ve been to both of them and there is anything but a Woodstock vibe.
Some festivals that get "lost in the mix" when historians talk about Woodstock. These all look to be more rock and roll (and blues) than the 'self important' folk rock scene of Wooddstock.
From the same year (with many of the same bands)
Toronto was before it. Atlanta Pop was before it. Texas Pop was after it. Toronto Rock Revival (with the Plastic Ono Band) was after it. Palm Beach Festival may have been created to cash in on it after the fact.
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And the next year:
And some of these were in sports stadiums, not open fields.