A bidding (neithior) was an invitation by mouth by a bidder (gwahoddwr) or, from the early 19th century, by printed letter, to a wedding feast on or just after the wedding day. The guests were encouraged to lend the couple a present, often a small amount of cash, which would be repaid at an appropriate event such as a wedding in the lender’s family.
Bidding seems to have been restricted to south-west Wales including Cardiganshire.

The images include:
Newman (small) no. 6 ‘The Bidding’ (1850s-1870s)
Newman (large) no. 4 [indoor bidding] (1850s-1870s)
Rock & Co. no. 12, Neithior yn Nghymru _ A Bidding in Wales, 1853
A Welsh Bidding, 1850-1870 (outside)

J.C. Rowland sketched a bidder inside a cottage which was produced as a print: "THE BIDDER / Published by T Catherall, Eastgate Row, Chester / June 1st 1850 / J.C. Rowland Del." (NMW A 98.389) The original sketch 'The Bidder' signed 'J.C.R 1850' is in the National Museum of Wales (NMW A 16282)

Hugh Hughes published a wood print entitled 'Gwahoddwr' [Bidder] of a bidder speaking to group of four people inside a cottage. It was published in Yr Hynafion Cymreig, (John Evans, Carmarthen, 1823)
(Peter Lord, 'Words with Pictures', (1995), p. 90