Conservative Mother vs Open Bar

Tell your mom to just get with the times and make her a cosmo n tell her to relax. She’s going to give herself a stroke being such a nutcase.
It’s your wedding day. You need open bar. Or else no one will want to go

Your wedding, your decision. She already planned her wedding so this is your and fiance's turn. Serve what you want and she does not have to drink but she needs to respect your decision.

Is she contributing money toward the wedding? If so, then return the money to her and plan what you and fiance want within your means.

Time to have a come to Jesus meeting with her. Be honest & tell her there will alcohol served- if she does make a scene then you will have no other choice but remove her from the festivities. This is your wedding, not hers.

You need to sit down and talk to her. She can attend the ceremony, then leave.
Or she can stay, eat and drink what she likes, non-alcoholic choices, and allow others to eat and drink what they want, without any commentary. It is exceedingly bad manners to preach to other people about what they are eating and drinking, at any party, group meal, or restaurant. And she needs to act like an adult and mind her manners. Talk about whatever social discussions are talking about, without criticizing the hosts. Someone who criticizes their host will have to leave. That rudeness, you will never tolerate.

If you let her win this battle , she will push for more.
In your relationship, when there is a thing you don't care about or don't know what to do/say ,but your man and your mom do and have a different opinion, you should ALWAYS HAVE HIS BACK, since this is what you already promised him when you aggreed to marry him.Be a united front, especially when it vs your and/or his parents or she will push for more ,about your wedding and your married life. I'm sure this is not what you want ... but this is what you'll get if you let her win this one.
If she contributes money , she should only have a say on the guest list ( let her invite some of her friends,cousins,aunts-uncles for instance) and maybe on the venue but not for other stuff. If she doesn't contribute, you and your man make ALL decisions.Plus you already answered your own question with this " I don't want to take away drinking for everyone just to make my mom happy."LOL.GOOD LUCK ! 🍸🍺🍻🥂🍾🍷🍹🍸🥃😃

It's not her wedding. Your wedding, you make the rules, and "no" is a complete sentence.

If you think she'll make a scene, ask one of your BP to be in charge of escorting her out, and asking her to leave.

It will reflect far more on her than it will on you.

Are there other family members that she is close to that you could ask to help you? I’m thinking to talk with her beforehand (as well as you talking with her) and keep a watchful eye on the day.

Maybe remind her the literally serve wine in church haha! To be honest, sounds like she could use a drink. It’s your wedding, do what you want.

I grew up in a strict fundamentalist evangelical cult. I know exactly what you are going through.
Will she be the only one like this attending, or will she have an entourage of others with her?
If she’s the only one attending, I suggest a frank talk. Not to convince her to accept it. But to remember that adults don’t cause scenes. If she does cause a scene, she will be removed by <security/burly friend/someone> and that this will damage your relationship beyond repair. Focus on the behavior - she is a grown woman and causing scenes because she doesn’t like what someone else is doing is absolutely not acceptable behavior. Ans make plans - ask someone who you trust to be mindful of her and at the first sign of trouble, she’s out. Warm the venue that you may be kicking someone out.
If she’s attending with a cohort of like minds, find the most reasonable and kind person and approach them. Appeal to their good nature, and to loving the sinner and not the sin. And tell them also that anyone who causes a scene will be escorted out. You have to MEAN IT. The first sign she or her group start making comments, they are out.

If you really want alcohol there then give her a warning. Ha! Strict? My mom wouldn't even allow my siblings I to drink soda. Lol. It's fine to have alcohol but I don't think you should factor his family sneaking in a flask to contribute to your decision to have it. The way I see it, I would feel like a person isn't being genuine if they cannot attend an event celebrating me without drinking. 😞 I can remenber having a graduation party and some ppl opting out bc of no alcohol.
Anyway, if you GENUINELY want alcohol there then I recommend you talk to your mom, be respectful but assertive. Tell her that it's what you and your partner decided on and it won't be on her dime.

Seriously , put your big girls panties and stand your ground.
When we say "pick your battles", you and your man have to fight this one.
Food and drinks, including alcohol and desserts, are always included by brides and grooms when you ask them "what are your top 3 priorities? " If you really want her to feel included/involved or want to "keep the peace" , give her a task you and your fiance don't care about: e.g: colors of flowers, decoration in general, ask her to give a speech or a toast, or whatever that you don't care much and that would appease her.Alcohol is a must-have, even when the bride and groom son't drink them , because your reception is as much about your guests as it is about you and your other half.