As a bit of side information I'm the future groom writing this so here it goes.
When it came time for me to propose I didn't plan anything extravagent. I had plans and had to cancel for any number of reasons for 3 months straight (i.e. she got sick, weather turned lousy, etc.) and I was tired of waiting. So one night at her parents house I mentioned we take our dog outside before bed (we were in town visiting) and we walked around the yard for a while. I began discussing some of the times we had dating over the last 4 years but was so nervous I'm sure she knew what was coming. As we were sitting on the porch (as she turned her head to dodge the dog) I slipped onto the step in front of her and proposed (kneeling). She was of course all excited but afterword she has mentioned how she thought I would have put more thought into it since I can be pretty creative. I've explained I tried but she's still bumbed about it 7 months later (especially when she sees the proposals of some of her friends which have happened recently).
What I am asking is if it is too late to throw her a surprise engagement party to give her that "special" setting she's wanted? I was also thinking about writing a little speech about how I know the first proposal wasn't really story of all time worthy and re-propose. It may be corny and embarrasing for me but if it would make her happy I would do it in a heart beat.
Sorry for the long winded description but if you girls can give some advise I would greatly appreciate it.