The wineries receive this type of request on a regular basis. While they all would enjoy being able to accommodate the many requests, the liquor laws prohibit the wineries from donating wine. The wine must be purchased. If you have a benefactor that would consider purchasing the wine on your behalf, that would be an option.
Some wineries may be able to provide coupons that can be used for a wine tasting experience. Each winery determines the number and type of coupons available.