Is our reason for missing my cousin's engagement valid?
My wife and I have long been planning and saving for this trip and we fly out on the morning of April 24th. We will be gone for a month out of country and so a lot of preparation and packing will be needed to be done. My cousin happened to get engaged over the weekend and is having her party with her family on April 23rd. It's not that we don't want to go, but this party was only just announced today and so we were subsequently invited just today. I said we would try because it's literally the night before we leave for our trip, but that it doesn't seem likely as we will be needing to pack and prepare for our trip. Typically people who get engaged and throw themselves and engagement party give their guests at least a month's notice, so this is unfair for us that it's this short notice. Not sure if I should be feeling bad cause I don't. They could have honestly waited during June or July when the weather gets better here as well.
FYI - April 22nd we're going to another wedding and can't pack during then either.
For the record the same cousin was also unable to attend my wife's bridal shower a few years ago, and it was my aunt (the same cousin's mother) who threw it.
Additionally, the same cousin was originally telling people to expect an invite for her upcoming engagement to be sometime June or July.
We're still going to buy a gift for the couple (weather we attend or not), but our other dilemma is they're throwing the engagement party at a venue nearly 90 minutes away from where we live.