Dear Abby: Am I wrong for telling my SIL and BIL that they should have talked to me before inviting his children to my event?

DEAR ABBY: I have been an amateur astronomer for 25-plus years. I always go meteor watching as well as observe any celestial event. This year I invited my brother-in-law and his wife to watch a meteor shower with my husband and me. Since we both have campers, I reserved and paid the deposit for two...