Does anyone have tips on planning a wedding around 3 children please?

Involve your children, wether they help with invites gifts or Evan just the sweet table it will get them excited

Depends on their ages but I would definitely have someone to supervise them on the day whilst you are busy.

You could have a kid's corner or table full of activities or games for the reception.
You could also see if they will do a little reading or poem.

I'm having little craft bags on the tables to keep them busy. Then having a kids entertainer / DJ for the evening. X

My 7yr old is making our cake topper, from Lego. & depending on final venue for reception getting so out door games from Home & Bargains..