From Lleida · 41.62° N · 0.62° E
Three getaways with a night away and four day trips for 11 May, Sant Anastasi, Lleida's holiday: what works when it is a festival in your city and a working day outside, from the Lakes Train to Núria, Cardona, Alquézar and Sant Jeroni.
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The historic Lakes Train leaves on spring Saturdays at 10:40 from Lleida, so the Festa Major Saturday fits whole. It returns to the city at 19:00, in time for the evening events.

In mid-May the Priorat vines have new leaves and the reservoir kayak opens on spring weekends. The 4x4 route goes out with a single vehicle: book it before the accommodation.

11 May is a holiday only in Lleida: in Cardona it is a normal day, and if it falls on a Monday, castle and mine are closed. Do the getaway before the holiday; from May the castle closes at 19:00, and on Sunday at 15:00.

In mid-May Núria goes from snow to meadows, and midweek the Rack Railway is much emptier. If Sant Anastasi falls on a working day, it is the day to go up: buy the train online all the same.

The Vero walkways are done in May without the heat, and on a working 11 May in Aragon Alquézar has few people. The collegiate church and museum have visiting hours: start with the walkways first thing.

May is the last month of the good season for going up Sant Jeroni, before the heat. On a working day the Aeri has hardly a queue, and the two-and-a-half-hour circuit is done with the air still cool.

In May Muro de Roda is seen with the countryside green and the Mediano reservoir below, and on a working day the Plaza Mayor in Aínsa is almost empty. El Bodegón de Mallacán is open all year: book all the same if you go at a weekend.
Questions
No, it is the local holiday of the city of Lleida. In the rest of Catalonia and in Aragon it is a working day.
If it falls on a Monday, whatever closes on non-holiday Mondays: Cardona castle and the Escaladei charterhouse, among others.
Geocaliahttps://www.geocalia.com/en/spain/catalonia/lleida/getaways/sant-anastasi-long-weekend