What would you do? 😞

For my fathers bday (in December), I wanted to buy him concert tickets he’d enjoy. I mentioned it to my sister because the tickets are close by her home and thought maybe us siblings and my dad could go for a weekend vacation. The concert is about 8 hours for us but 1 hour for her. Sooo we tell him we are going that weekend to plan. The tickets were on presale- I was going to buy them but she advised me to wait that the price would go down🤷🏼‍♀️ In the mean time she decides she wants her boyfriend to go also, so I ask my husband and he’s hesitant. I finally convince him to go that we’d have fun, although it’s extremely expensive. Anyway my sister tells me she will purchase all of the tickets and we can pay her back for ours. So I booked the hotels, and planned on it. Wellll since then she decided to schedule her baby’s baptism THE NEXT MORNING. I was pretty livid because that meant more family members down there, less time in the city, less time with my father .:/ my mom in particular (they recently divorced and she is a horrible person) and our special time is being imposed on. She had told me she’d never schedule it for that weekend, yet she did!!! Sooo now my husband really doesn’t want to go away for basically ONE night and spend almost $1,000- which I agree. Wellll Ontop of it my sister never even bought the tickets!!!! It’s in less than two weeks and she tells me let’s wait till a few days before and if it’s sold out “ohwell”. I keep telling her it seems pointless for us to come and spend all that money to not even go to the concert ( the main reason for going), but now it’s turned into us not going to the baptism if we don’t go. I’m so frustrated! She made it about her daughter and not my dads bday gift! My plans got all messed up. And if you’re wondering why I can’t just get the tickets because they are $200 each and we are 6 ppl. We can’t afford all that right now. What would you do? How would you feel? I’m at a loss.😭