Given a travel related situation, and given a specific question about the situation, summarize the question into a title
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Question: I'd like to see the Catacombs of Paris in September 2017. It appears that tickets can be purchased in advance from http://b12-gat.apps.paris.fr/accueil.aspx ...  is the demand such that purchasing tickets in advance is necessary if you want to see it?


Answer: catacombs of paris: should tickets be purchased in advance?


Question: As an example I've recently been to Paris and the level of credit card adoption there is so high I didn't once need to take out cash. I likewise assume many of the locals avoid cash altogether and only pay by card. 

But what's the etiquette in places where tips are common, like bars and restaurants? Are you supposed to keep cash just for the tips? Or is it up to the waiter/barman to offer you a tip option on the card terminal? I've tried asking the wait staff if I can leave a tip by card but they either misunderstood me or their POS terminal didn't have such a feature. 


Answer: Are cash tips still expected in cities where nearly everything is cashless?


Question: I recently applied for a short-term student visa, mentioning the departure and return dates as 13/05/18 and 10/08/18 (=90 days) respectively. After my visa got approved, the validity dates mentioned were 11/05/18 and 08/08/18 (=90 days) but since I have already booked my return flight on 10/08/18 and if I return back from France on 10//08/18 I'll be violating the visa policy. 

What will be the best thing which I can do in this scenario? 

If I go with this visa and violate the visa policy by exceeding the visa's validity by 2 days what consequences can I possibly face, considering the face that it wasn't actually my fault but a sheer mistake committed by people in embassy?


Answer:
Can I stay in France more than the validity range of my Schengen visa given I'm not exceeding my duration limit?