When is the bring a friend for free... can I bring a friend both days?

For free friend offers, only one free ticket may be used per Pass Holder per day. You and your friend must enter the park turnstiles together when your Pass card is first scanned for the day. Please double check your coupons to verify if the offer is valid at Six Flags Over Texas or Hurricane Harbor in Arlington. Coupons valid for the wrong park will not be accepted.

Just look online also cx

If you download the app and scan your pass, it will give you all the valid dates and what will be accepted on those days.

The dates are liated on the website.

Call and ask-