All four Irish provinces are in URC playoff action, but for at least one of them the season will end this week.Just as they did on the opening night of the season in September, Ulster and Connacht kick off the playoffs in Belfast, where Dan McFarland's side will be hoping for a repeat of the regular season, where they won both meetings with the western province.A win for Ulster would see them at home in the semi-finals against either the Stormer or Bulls, while Connacht would be heading to South Africa if they pull off a surprise win at Kingspan Stadium.On the other side of the draw, Leinster and Munster will be hoping to set up an all-Irish semi-final next week.Leinster host the Sharks at the Aviva Stadium on Saturday evening, as they keep their drive going for a URC and European double, while Munster travel to Scotstoun to renew one of the best URC rivalries in recent seasons with the Glasgow Warriors. TV Leinster v Sharks (5pm) and Glasgow Warriors v Munster (7.35pm) are both live on RTÉ2 and RTÉ Player on Saturday, while Ulster v Connacht (Friday 7.35pm) and Stormers v Bulls (Saturday 2.30pm) are live on TG4.All games are live on URC TV. ONLINE Follow live scoring and live updates on rte.ie/sport and the RTÉ News app with match reports and reaction from around the grounds. WEATHER It will be a mild evening in Belfast on Friday for the meeting of Ulster and Connacht, with temperatures around 12C, but carrying the possibility of some rain showers over the course of the evening.Conditions will be similar in Dublin and Glasgow on Saturday evening, with rain expected for the games between Leinster and Sharks, and Glasgow v Munster.