• Where are you watching tonight?
• Have you got carried away and made massive plans?
• Has anybody got an older nan than Gav (see 18:29)?

Jason Hughes: I'm a proud Welshman living in New York. Watching the build-up on the BBC sports page before heading to the bar. Needing a pint...

Jo Howarth: Just seen the Portugal team, Wales can do this!

Sahil Oberoi: Two pretty ordinary defences, expecting a goal fest tonight!

They've written the theme tune, now they're in the sticker books.

In another life Nicky Wire may have made it as a ball-playing centre half by the way.

gwenalt2: Nervous, excited, paranoid but loving the #Togetherstronger, external. Nails bitten, clock checked... let's do this boys. Mythology awaits!

Image source, Getty Images

More than half of Wales' population of three million are expected to watch their country take on regular European semi-finalists Portugal - eclipsing the national television record, external for a sporting event, which was only set on Friday for their 3-1 quarter-final victory over Belgium.

The Prince of Wales sent the team a "huge good luck" message, saying: "I'm sure they have got a very good chance of beating Portugal. Everyone here will be keeping their fingers crossed."

Not the most ringing of endorsements really...

Phil McNulty
BBC Sport chief football writer in Lyon

The Stade de Lyon is still sparsely populated but there is a sense of occasion and history that is already making this atmosphere electric.

This huge bowl of an arena is heavily dotted with the red of Wales and former internationals have been huddled in corners discussing the most important night of football in the country's history.

Men like Kevin Ratcliffe, Iwan Roberts and Nathan Blake suffered the tough times as well as successes - will they witness history here tonight?

ONE HOUR TO GO. The Wales players all looked so relaxed on their little walk about a few minutes ago. I would be racked with nerves.

The Uefa cameras are doing a good job of selling Lyon to me. Looks a cracking place. 

Only France (11) have scored more goals than Wales so far. Here are the 10 in red...

BBC Radio 5 Live

BBC Radio 5 live has full match commentary of tonight's semi-final.

Former Wales internationals Nathan Blake, John Hartson and Kevin Ratcliffe will be talking you through the action along with John Murray and Rob Phillips.

Build-up begins at 19:00 BST, and you can listen using the Live Coverage tab at the top of this page.

This is the seventh time Portugal have reached this stage at a World Cup or European Championship, but only once before have they advanced to the final – on home soil at Euro 2004.

Here's a rundown of their defeats:

Image source, Getty Images

1966: Lost to England

1984: Lost to France

2000: Lost to France

2006: Lost to France

2012: Lost to Spain

Dean Saunders
Former Wales striker

Wales are on the crest of a wave after what we have achieved in France so far, but this is a totally different test.

Portugal are yet to win a game in 90 minutes at this tournament and, although I am backing Wales to win, I have a feeling this one will go to extra time.

Portugal, in contrast to Belgium, are a safety-first team who will keep their shape far better. Rather than there being lots of chances for both teams like there were in Lille, this will be a game of few opportunities.  

Read more from Dean here

And the two enforced changes for Wales are as expected.

In come James Collins and Andy King for the suspended duo Ben Davies and Aaron Ramsey.

There are three changes for Portugal tonight - and Real Madrid defender Pepe is not fit to take his place.

He is replaced by 34-year-old Bruno Alves. Also in are Danilo and Raphael Guerreiro. 

Image source, Getty Images

Dreams, it turns out, can come true. Gabrielle was right all along.

The 23 players and staff of Wales have captured the imagination of the whole country - as well as much further afield - in the last few weeks.

Jonathan Ford, chairman of the Football Association of Wales, told BBC Sport: "It is history in the making, it's a dream come true.

"These players will run through brick walls for us. This has been a fantastic demonstration of team spirit, team morale, teamwork.

"Sport and culture are the two things that really help us define Wales and the Welsh people."

While the men's Wales team are fully focused on playing the game tonight, we meet Cheryl Foster who, after a record-breaking career for Wales, found another way of staying involved and staying centre stage of the match.  

A sea of red ants - Wales fans - pour out from the train station towards the stadium in Lyon.

Kick-off is now just 75 minutes away. It's a lovely evening for it. 

It's not about money at this stage - but how much could Wales make in the tournament?

Here's a rundown...

Participation in tournament - 8m euro (£6.4m)

Each win in the pool stages - 1m euro (£812,000)

Reach last 16 - 1.5m euro (£1.2m)

Reach quarter finals - 2.5m euro (£2m)

Reach semi finals 4m euro (£3.2m)

Champions 8m euro (£6.4m)

Image source, Getty Images

• Where are you watching tonight?
• Have you got carried away and made massive plans?
• Has anybody got an older nan than Gav (see 18:29)?

Chris: I'm a Welshman now living in Richmond Virginia - nervously viewing the bbc sports page waiting for later... Cmon Wales!