My sister recently got engaged and my wedding is in the next month. Today I received an email with no prior notice, inviting me to her engagement party on the Monday after my wedding (2 days later). She is hosting it herself (not thrown by someone else) She has no date set and no intention of marrying next year at all so why ruin my special time? Is it bad taste or am I a bad sister for being upset by this move? Couldn't she wait? She has the next few years dedicated to her. I know she is excited but I am excited too, for the wedding. We live 10 minutes from each other so we talked and I let her know my feelings but she said I shouldn't care since 2 days will have passed. Thoughts?