The week ahead in Europe will be highlighted by two very important events, as both the European Central Bank and OPEC ministers hold meetings. According to Antonia Oprita, Senior Editor and Columnist for Real Money, investors will be closely watching what the ECB says about its corporate bond purchase program, which is expected to begin in June. She points out that companies have already increased their debt offerings in anticipation of the program. Oprita says when OPEC ministers meet on Thursday, there may be less pressure for production cuts now that oil prices have risen. TheStreet's Rhonda Schaffler has details from Wall Street.