On a Friday before a holiday weekend, it could be rather early.

I imagine things will be busy before 5 anyhow. I'd like to say I will get there early to grab a table but taking the last month as an example, I will be doing very well to get there by 6. I work up in the airport, so I have to travel in.
Is McDaid's likely to be as busy as Stag's Head? Probably I suppose.
Tormund, will you have an active mobile phone in Ireland? Worse comes to worse and it is completely chockers, we could try to find another pub on the day. So if I have people's phone numbers, I can at least text/ring them with an alternative destination. There are lots of pubs anyhow, so we never have to walk far. The only numbers I have at the moment are Peadar's and Renya's though.
OTOH, if somebody doesn't mind getting in early and maybe waiting a bit for others to join, that works too.