Tomorrow I am decorating a wedding cake for Saturday.
The cake will be outside and the temp is supposed to reach 100 degrees. It will be under a covered pavilion but I am still worried about the heat.
Is there anything I can add to my buttercream to help it not to melt? Or will it be o.k.?
My icing only uses crisco, no butter.

All shortening frosting should be okay in the heat as long as it isn't in direct sunlight, but you may need to use less liquid than you normally do because of the humidity.