Conflict

I attended a two-room rural schoolhouse in Indiana in the mid 1950s. This year a few of are organizing a reunion for any and all who attended that school and the other two township country schools.
We picked a day in June and began making plans.
We reserved a shelter house and mailed out invitations and are going to publish a bulletin in the local papers.
We planned for food.
And then I found out my granddaughter's high school graduation in that same weekend in Las Vegas!
I was told the graduation was the FOLLOWING week.
A victim of bad information.
Now what?