While I am not doing it during this event that is exactly what I did during Anya's first event. I activated the boosts and continued leveling and CCing my units burning stones during the monday daily etc. In the end I manged to finish it off with all 24 stars to pick up Anya's sealed form.
Just keep checking here/youtube and ULMF at the strategies people are posting and adapting it to fit your specific units and capabilities. Conrad was the unit that saved my butt ultimately when somebody posted about how good he was at taking down the dragon mages.
This event is defiantly one of the harder ones, but it also doesn't require a full 3 star sweep.