Hi.

Solution to your query will be through a means of hit and trial since this is not a generic question. So, there are following things you can try:

1. Contact the head/coordinator/in-charge regarding this matter and ask them if they could find your registration form or something alike, that has your alternate MAIL ID. However, it is quite unknown that a drive would choose to send email to an alternative rather than primary email.
2. If t was GMAIL then there is always a phone number or another gmail id attached as a recovery measure you could try accessing the confirmation ID from your primary id.

Please let me know if any of the above work and it is STRONGLY RECOMMENDED that you have separate professional and personal email ids and also use alternative email ids for other purposes instead of giving them in an important drive.

If you have more query then please feel free to comment.

Best of Luck.