Please do not worry about your I-20 and enjoy your summer vacation.
the following paragraph is replied by graduate admission advisor. if you are nervous, you can send the email to your advisor.
For I-20 information, or any form of assistance in the admissions process, please encourage students who have already applied to the Graduate School to contact their Admissions Advisor in the Graduate School. We divide applicant files by the first letter of their last names (family names), in this way . They will be able to identify who their advisor is by the list below.
A-F Advisor is Andrea Kanevsky at KanevskyA@missouri.edu
G-Lit Advisor is Sue Allmart at AllmartSue@missouri.edu
Liu-S Advisor is Stephanie Dager at DagerS@missouri.edu
T-Z Advisor is Christine Platto at PlattoC@missouri.edu