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First of all, take a look at your bylaws and CC&Rs. Check what kinds of violations your HOA can fine you for. I’m willing to bet “not attending social events” isn’t one of them. That’s your free will.
Next, take your problem to the board. It would help if you got some support from fellow homeowners, too. Let the board know that what they’re doing is not with keeping in line with your governing documents.
If they still don’t budge and you end up getting fined, sue.