Currently, when viewed on smaller devices or in widget areas, the text inside each box just scrunches up to try and fit inside the smaller cell/box. A few other calendar plugin developers solve this problem by having a breaking point where the text simply turns into dots. A dot indicates there is an event on that day. When you hover over a dot, a "tooltip" appears with the information. This makes for an elegant and seamless transition from full-width desktop view to mobile view. This would also enable you to put the grid/monthly calendar in a widget and it actually look good / readable / professional.