Is it rude to send invitations in a group chat?
For casual gatherings, no โ that is where friendship lives these days. For weddings and milestone events, a blast to people who matter reads as an afterthought. Post to the group if you like, but back it with individual messages to everyone important, and ask for answers on the page rather than in the chat.
Should I message each guest individually?
Match the effort to the relationship. Best friends and family get a message written for them. Colleagues and the wider plus-one tier are honestly fine with the group line. The rule: nobody close to you should ever feel they were messaged in bulk.
What do I do if someone forwards my invitation?
Nothing dramatic. Your named guest list decides who is invited; a forwarded reader sees the occasion, and that is the same as a card glimpsed on a kitchen counter. If they ask directly, be warm and honest โ a genuine note about keeping it small ends the matter.
How far ahead should I send?
A casual birthday: two or three weeks. A wedding: several months, earlier still if guests must travel. Whatever the occasion, put the reply deadline inside the invitation so nobody has to guess how long they have, and the forwarded copies carry it too.
Can guests reply in the chat instead of the page?
At least a few of them will try. Accept the warmth, then point to the page once โ the answer needs recording in one place for the count to mean anything. A yes typed in chat and scrolled past is not an answer yet; on the page, it is.