How to word an invite so people know it's not a surprise!

[Thisismynewname123]

We're making a party for my mum's 70th birthday. I want to word the invitation so that people know that it's NOT a surprise party, as otherwise people are unsure whether they can mention something or not. Any suggestions on the wording?

[Floggingmolly]

Mum is looking forward to seeing you? Why would everyone assume it's a surprise though?

[sooperdooper]

I'd never assume a party was a surprise unless it specifically said so

[BIWI]

How about 'Thisismynewname and Thisismynewname's Mum look forward to welcoming you to a party, to celebrate Thisismynewnames Mum's 70th birthday, on ... '

[Thisismynewname123]

We sent out a save the date a few weeks ago, and have had people saying they weren't sure if it was a surprise. So want to make it clear on the invite

[WhoKnowsWhereTheT1meGoes]

I would have thought the assumption is that it's not a surprise unless you say it is?

Something along the lines of "Mum would like you to join her for a party in celebration of her 70th birthday" should be fairly clear.