Not a problem, they have extended validity to 90 days, check here on forums or cic web. Alternatively, try some other places like Kolkatta. Even I had to go to Kolkatta in June as the appointments in North & West were booked for many weeks.
Update from my side, I applied for TRV on April 26th and went for Biometrics in June and there was no update. Then on the 8th, based on CIC updated recommendations, I reapplied on 8th Sep and the application was seen and processed very fast. Got the passport picked on the 14th and today consulate has sent it back to VFS. I can already see a counterfoil number of the Visa on the online portal. I Hope, I am interpreting correctly and get the passport back soon with stamped visa.
I think the earlier Applications were processed by machine and there must be errors. I was given a totally different UCI on the new application in April even when I had an old UCI for the past 10 Years, common on TRV as well PR and clearly mentioned in my application. I tried getting it updated but with no success. Now, on the new application, I mentioned the new UCI, as my Biometrics was linked with that number, but the acknowledgment that I got, had old UCI and Biometrics from the April application. I realised some humans are now actually working!
Good work by CIC after the initial lull. Hope it works for needy people like me, my spouse and son are Canadian citizens and I haven't seen them now for over 12 months.