Curated for your dates, your cities, and what you said you care about.
Madrid's biggest annual festival overlaps your full Madrid stay. Free concerts at Plaza Mayor and Las Vistillas every night, fireworks May 14 at midnight, the solemn procession + cocido tasting on May 15, and a Pasacalles parade through old Madrid on May 16. Treat it as the spine of your Madrid days.
Plataforma 0-3 has called a city-wide demo for May 20 (mostly nurseries/early-childhood centers). Won't disrupt tourism, but expect some street presence in the centre. Education strikes also rolling May 18, 27 — none of these affect tourist transport.
Free regional rides ended. New pass structure for occasional vs frequent travelers. Affects you only if you do day trips out of Barcelona (Girona, Sitges, Tarragona). Buy tickets at the machine, no advance booking needed for short routes.
Falls right in your "open days." Most state museums free with no booking: Prado, Reina Sofía, Thyssen in Madrid; MNAC, Picasso, MACBA in Barcelona; the Museu de Belles Arts in Valencia. We've factored this into the suggested days 6–9 below.
Reported 115 cruise ships + 34 conferences in May (~90,000 delegates). Sagrada Família and Park Güell will be at peak crowding — book timed-entry tickets at least 5–7 days ahead for both. La Boqueria is also notoriously packed; go early (8–10 AM) or skip it.
AVE Madrid → Valencia: 1h45m · Euromed Valencia → Barcelona: ~3h
It's the cleanest way to break the Madrid–Barcelona journey, and it's the strongest match for your interests of any Spanish city we know:
→ Architecture: The City of Arts & Sciences (Calatrava) is arguably the most striking modern architecture complex in Spain. The historic centre adds Gothic + Modernist layers.
→ Arts: DocsValencia International Documentary Festival runs May 15–23 (films at La Filmoteca, Cines Lys). "Tiempos Modernos" Valencian post-war art at the Museu de Belles Arts. "Surrealismo dorado" exhibition opens May 6.
→ Views: Climb Miguelete (Cathedral bell tower) for the old-town panorama; the Umbracle terrace at City of Arts gives you the modern skyline.
Trade-off: if you'd rather not move hotels mid-trip, you could base in Madrid for the full 8 days and do the days below as Madrid day-trips (Toledo, Segovia, Aranjuez). Valencia just gives you more variety.
Your Madrid stay overlaps the full San Isidro festival peak. Below are highlights from the festival schedule plus arts/architecture events in your dates.
Fri 15 May, 00:00 (Thu→Fri midnight) · Pradera de San Isidro
Grand fireworks display closing the patron-saint festivities. Big local turnout — go early to claim a viewing spot on the Pradera or watch from the bridges over the M-30.
Multisensory immersive show — pause-breathe-rediscover concept. Walking distance from Castellana / Salamanca.
Brand event — listed for completeness, easy to skip.
Spain's most representative ceramics + pottery fair — 4 days only. Walking distance from Malasaña; pairs nicely with a tapas crawl in the afternoon.
Big-name festival concert in the city's most beautiful square: Miguel Ríos, OBK, Celtas Cortos, Nena Daconte, DePol. The architecture of Plaza Mayor at night, plus a free concert — quintessentially Madrid.
Free demo by a master from the Escuela Oficial de Cerámica. Part of Feria de la Cacharrería.
City Council's gastronomic tribute to the patron — free tasting of Madrid's signature stew, no booking needed. Get there by 14:00 for the queue.
The image of the saint is paraded through central Madrid. The single most traditional event of the festival.
Iconic Spanish rumba group at the festival's main outdoor stage, leading into midnight fireworks.
See highlight card.
Festive parade through historic Madrid — a guided walk through the old quarters as celebration. Excellent way to do the historic centre on your last day before Valencia.
150+ exhibitors of antiques, vintage, collectibles. Worth a half-day if antiques scene appeals.
Final San Isidro evening concert in Plaza Mayor.
UNESCO old town: Cathedral (one of Spain's finest Gothic), Alcázar with city panorama, Synagogue del Tránsito, El Greco's house. Easy day-trip — leave Madrid 09:00, back by 19:00.
The Roman aqueduct alone is worth the trip. Add the Alcázar (the Disney-castle inspiration) and the Cathedral. Pair with Toledo if you want two day-trips in one stay.
Massive 16th-century royal monastery — a building of historical and architectural weight. Half-day works fine.
If you take our suggestion: 4 nights to break the journey. Highlights below from your dates.
Most museums free with no booking. Hit Museu de Belles Arts (free anyway, but uncrowded) or the IVAM (Modern art).
International Museum Day event — free guided solar telescope session in the gardens. Perfectly placed inside the Calatrava complex you'll be visiting anyway.
Photography + illustration workshops on May 18. Worth knowing if you go to the Oceanogràfic.
The 10th edition of Valencia's international documentary festival — Swedish filmmaker Gertten gets the festival award + retrospective. "Big Boys Gone Bananas!" screens this day.
50 works by Eusebio Sempere, Equipo Crónica and others — the major contemporary survey of the season.
Traditional public veneration — only mention if you want a final piece of local atmosphere before the train.
Your Barcelona arc lands on a strong cultural week — international poetry festival, two new exhibitions, and a major sailing race off the coast.
Thu 21 May, 20:00 · Palau de la Música Catalana
The closing gala of Barcelona Poesia at one of the most architecturally extraordinary concert halls in the world (Domènech i Montaner). Even if poetry isn't your thing, the venue itself is the reason to go — buy tickets even just for a tour earlier in the week if you can't make this evening.
Renowned guitarist + pianist duo at Barcelona's longest-running jazz club. Easy first-night option after the train.
See highlight above.
Thousands of balloons fill the venue — limited run. Quirky photo-op afternoon.
Free outdoor classical concert in a leafy uphill park. Good "nice views" combo if you walk down through the upper Eixample after.
Major sailing race. Great views from W Hotel terrace, Hotel Arts, or Bunkers del Carmel for distance shots over the city + sea.
Cultural fair celebrating independent publishers + cooperative bookshops. Worth a couple of hours.
Listed for completeness — family-oriented.
Contemplative exhibition of paintings 15th–20th century, themed around spiritual reflection. Right next to the Cathedral — folds easily into a Barri Gòtic walk.
400-work exhibition built around Mercè Rodoreda's literary world (Catalonia's most celebrated 20th-century writer). CCCB is a great architectural conversion of an old hospice — building + show both worth the visit.
Medieval old town with intact city walls (walk them for the views), Jewish quarter, the rainbow-coloured houses on the Onyar river, and a stunning Cathedral. Easy half- or full-day.
Bohemian seaside town with the Cau Ferrat museum (Modernist artist Santiago Rusiñol's house) and the Maricel Museum. Coast walk under the Sant Bartomeu church is one of the prettiest views on the Catalan coast.
UNESCO Roman ruins (amphitheatre on the sea, circus, walls) blended into a working Catalan city. The Mediterranean Balcony gives one of the best coastal panoramas in Catalonia.
Done — three of each above. For Madrid, Toledo + Segovia are the classic "architecture + views" pair, and they can be combined into two separate day trips out of the same Madrid base. For Barcelona, Girona and Tarragona are the strongest matches for your interests; Sitges is the relaxed half-day.
Our pick is Valencia (4 nights) for the reasons in the recommendation card above — best interest match + cleanest routing toward Barcelona. If you'd rather not move hotels, swap to Madrid-base + Toledo + Segovia + Aranjuez as day trips.
Each event/day trip above is tagged with which interest it serves. Wine-tasting events have been filtered out; we've avoided suggesting Montserrat, Montjuïc-on-foot, or Garrotxa-type day trips. Where a day trip involves any uphill (e.g. Bunkers del Carmel for views), we've called it out.
The two cities you're spending all your time in face off in the title-deciding Clásico the day before you arrive. Watch any bar in Madrid will be packed; tell taxi drivers you're a tourist if you want polite conversation.
Centenary of Gaudí's death is driving a surge in escape rooms, night sessions, and immersive Gaudí experiences alongside the traditional tours. Worth a look if you want the Modernisme angle without the queue.
Doesn't affect your dates (changes start June), but useful context: in May, Retiro can close on windy/storm days. Have a backup if your weather turns.
Irregular thunderstorms forecast through May 8 — should clear well before your arrival on the 20th. Mentioned only because long-range patterns this season are unsettled.