He's not lovely. He's not.
Lovely people don't treat their spouses as servants.
Lovely people don't dump all the grunt work on their spouses.
Lovely people don't assume all childcare is their spouse's problem.
Lovely people don't call you a nag for asking them to do their SHARE.
Lovely people don't say they're 'helping you' when they actually pull their thumb out and do something in their own home or with their own children because they think it's all your job to sort.
Lovely people don't always put themselves and their job, hobbies, personal time and fun time above their spouse's job, hobbies, personal time and fun.
Lovely people don't do these things. They just don't.
He doesn't see you as equal, and you think he is 'lovely' because unless you are actively calling him on the above behaviours and refusing to stand for it, he is getting everything he wants and you are the servant and childminder, also available for sex no doubt.
Tell him you'll be going to your event and he will be at home with his children unless he can sort childcare for his children.
Tell him from now on he will be taking sick days when the children are sick.
tell him you will have a regular gym schedule and he will be doing something with his children when you go.
Or stop doing anything and everything for him. Wanker.