That's what the RSVP is for. Once you know how many are attending you can let the venue know.

EDIT: didn't realize you expect your guests to pay.. That's rude. You are hosting the event - you pay for it.

You don't 'invite' someone to a party, ban plus ones and expect the guest to pay

It is extremely rude to ask your guests to pay. Otherwise what you want to include on the invitation is fine.

jack and rose are engagrd to be married. please join us for celebrating their engagement party. Time:6.00pm to 9.00 pm. address: RHR hotel, near railway station, Coimbatore-06.

How about a map to the location of the engagement party.

We are having an engagement party in a couple of months, and we are going to include the following on the invites:

(Roughly) You are invited to join (our names) to celebrate their engagement.

Then date and time.

Then location.

Then RSVP date, phone number to RSVP to and our requirement of strictly no plus ones.

We think the invite is pretty stock standard, but we are having it at a venue that does a set menu, and there for a set price per head. We aren't sure how to include this information on the invite, or how? (Or if we should).

Any tips or thoughts or hints would be fantastic!