Cake already decorated is bulging on one side and has cracked my fondant a little. I thought if I put it back in the fridge the bc would get hard and stiffen up. Any advice on how I can fix this problem? This cake wont be given till tomorrow. Help

Fridge is not a good idea. It is a bulge or a bubble? If it's a bulge, there's nothing to do at this point. If it's a bubble, get a pin and pick it and gently work the air out. Also try to get a knife uder the bottom edge where the bubble is to let air out.

Thankk you Leah, do you think after I do that I should just leave the cake out at room temp?