Hard cheeks after midface lift?

It seems that your recovery after surgery is going okay. After two days, the swelling is at a maximum and then starts getting better. 
To answer your one question, yes usually it is not uncommon for things to be swollen after a facelift. Usually it's worse the first week but gets better every week. I know it's hard to be patient after surgery.
If it does not settle, you can undergo corrective surgery with additional surgery.  I would recommend that you see a board-certified plastic surgeon in your area that is a member of both ASPS & ASAPS and performs a lot of facelifts if you want a second opinion and of course, make sure you follow up with your own surgeon and talk about this if you have concerns that linger. 
I hope this helps and wish you all the best in your surgery and event. If it does, please take a moment to up vote this answer on the “respond” button on the top right.  

At 2 weeks there is likely swelling present and I would followup with your surgeon...  Facial fillers may address other areas but it is important to understand the longevity of the filler