I'm a sucker for a good proposal, but I agree that there are some days in particular that are probably better off without them and here they are:
1. Christmas Eve
2. Christmas Day
3. New Years Eve
4. His/Her birthday
5. Your birthday
6. Valentine's Day
7. Anniversaries
Why not these days, you may ask? Well, not only are they stereotypical, but god forbid your relationship/engagement/marriage doesn't work out and then these special days are ruined for you too.