Small diy wedding, small details i could be forgetting?

We are doing a small DIY wedding this fall. So far the most expensive part is going to be my dress and the floral arrangements/my bouquet. My best friend is going to do my pictures (I'm going to pay her but she doesn't want to charge me at all), my MIL is doing the cake for free (her gift to us, she does cakes), the venue is a local beautiful campground that has an amphitheater/pavilion that only costs $25 to reserve for the day, after party will be on our property with BBQ food. A friend is going to help us with a party tent for the after party. We're doing our own music and making the majority of our decorations. We have rings picked out. I'm making my own invitations.
We have less than 70 people we are inviting, so it's not going to be huge. No actual wedding party (like bridesmaids/groomsmen). We plan to have my older sons walk me down.
I'm trying to figure out the small details/costs that I need to factor into our budget, things I don't want to forget until last minute. So anyone who has already done or planned a small/simple diy wedding before, I'd love some advice!