Temporary Account Upgrade Request for Pro and Basic Accounts

[Silbersalz]

Hello,
I hope someone can help me. Here's what it's about: I have a Pro Account. Another person is a member of this account with a Basic Account. Now this person has to hold larger meetings for no more than 4 months, partly in parallel to me. Can I temporarily upgrade the account for 2 times 2 months?
Thank you very much.