Submit a request here:
S8 Support
However, as the weekend is now upon us, it is unlikely that you'd get a full response before Monday, by which time, the event would be over.
I wish you guys good luck.
From a planning point of view, we should always stock up on bombs from our breeding during the days before the story events. Have 15 bombs coming into the event and try not to be tempted to mine for runes, (even if you aren't maxed out), unless your breeding allows you to replace the bombs you used. If we have a run of bad luck, we might very well end up using gems to clear this task.