Idiots guide to interment of ashes

[PangoPanda]

DF has arranged for interment of DM ashes in the local churchyard around Easter time. We are told this will be a 10 minute ceremony led by the vicar. This will be followed by pub lunch nearby. I work term-time so don't actually get a choice on when I take leave; does bereavement leave cover interments? Does one take flowers? I am assuming dress-code is slightly less formal than funerals?

My work wouldn’t consider this to be covered by bereavement leave.
I would take a small floral arrangement that could be left.
I would dress as if for the funeral not less formal but you can have it as formal or casual as you would like.

I’m sorry for your loss

If it's your mother's ashes and arranged by your father, you don't need to worry about protocol (unless there's some backstory of non contact which you're not telling). Do, and wear, whatever you want
I'd be surprised if you can get official time off work for it, but I don't think any decent boss would stop you going.
Why didn't your DF arrange it for the Easter holiday of he knew you were likely to be working?

We do burial of ashes any day of the week. Sunday afternoons are quite popular.

Get your DF to arrange a time that suits.

He has told other people the date now and they have made arrangements so cannot change it now. I just don't think he considered it as a problem. Partly the retired mindset when any day will do, partly thinking it was too important a thing (which it is to him) to be an issue.