Both of your sentences are correct. Use “saw” to talk about the past, use “see” to talk about what one usually does (present simple). As to Jillian’s comment: I'm afraid it’s not passive voice — it’s active. We saw things — things did not see us. We can use “during” or “on” in American English (I believe you can use “at” instead of “on” in UK English, at least for multiple-day holidays). On Saturday, on the holiday, on the 4th of July — this does not mean anything is “on top of” anything.