A mobile event schedule: when the big recurring events happen

Mobile development runs on two platform calendars, Apple's and Google's, and both have settled into a fairly predictable rhythm. New tools arrive at the same points each year, store requirements tighten on a schedule, and the big events land in roughly the same weeks. Knowing that rhythm makes it easier to plan releases, holidays and conference trips without colliding with the moments that matter.

What follows is the shape of a typical year as of autumn 2026, in general terms only. Exact dates change from one edition to the next and are set by the organizers, usually a few months ahead, so treat this as a planning frame and confirm each date on the official site before you book anything.

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The big recurring events

MWC Barcelona: late February or early March

MWC Barcelona, organized by the mobile industry association GSMA at the Fira Gran Via venue, is usually held over four days in late February or early March. It is an industry show first: network operators, device makers and chip companies fill most of the halls. For app makers its value lies mainly in seeing which devices and form factors are coming, foldables for example, and in meetings with partners who are there anyway. A product lead or founder with a full meeting list tends to get more from it than a developer would. The official site is mwcbarcelona.com.

Google I/O: May

Google's developer conference has been held in May in every edition of the past several years, over two days at the Shoreline Amphitheatre in Mountain View, California, with keynotes and sessions streamed online. The main keynote covers products across Google, with Gemini and AI features given a large share of the time. The developer keynote and the Android sessions are where app makers find the detail. Registration and the stream are on io.google.

WWDC: early June

Apple's Worldwide Developers Conference runs for a week, usually in early June. It opens on Monday with the keynote and the Platforms State of the Union, followed by sessions, labs and one-on-one appointments with Apple engineers. For most developers it is an online event: everything is free to watch, and the in-person part at Apple Park is small and by application. The first developer betas of Apple's new operating systems and Xcode come out on keynote day, which is when summer testing starts. Details are on Apple's WWDC page.

Android's major release: the second quarter

Starting with Android 16, Google moved its major Android release from late in the year to the second quarter, followed by a smaller release in the fourth quarter. Google described the second-quarter release as the one carrying behavior changes that can affect apps, while the fourth-quarter release adds new APIs without app-affecting behavior changes. Android 16 reached users in June 2025 and Android 17 in June 2026, with betas starting early in the year in both cases. For Android teams, spring is therefore beta testing season, not autumn.

Apple's September event and the new iOS

Apple has held its iPhone launch event in September in every year of the past decade except 2020, when it moved to October. The new version of iOS has reached the public about a week after the event, and Apple opens App Store submissions built with the new SDK around the same time. For iOS teams this is the busiest stretch of the year: the summer betas end, new APIs ship, and many users update within weeks.

Two store deadlines that recur

Both stores tie their minimum build requirements to this calendar. Each spring, usually in late April, Apple starts requiring that uploads to App Store Connect are built with the SDK released the previous autumn. Google Play requires new apps and updates to target a recent Android API level, and that deadline has fallen on August 31, with an extension to November 1 available on request in Play Console. Both are announced months ahead on Apple's and Google's developer sites, and both are easy to miss in a busy quarter.

The year at a glance

Planning a team's conference budget across the year

A conference budget is easier to defend when it follows this calendar instead of whoever asks first. Plan it in people and days before anyone looks at prices.

1. Block the weeks nobody travels. For iOS teams that means September; for Android teams the weeks before the August deadline and after the second-quarter release; for everyone, the team's own big launches.
2. Treat platform keynotes as shared team time, not travel. Book a room for the WWDC and Google I/O keynotes, then hold a short session later that week where each person picks the talks they will watch.
3. Give each person one travel event a year, chosen for its workshops or its people, and stagger the trips so a large part of the team is never away at once.
4. Fill the rest with local meetups and community days, which cost an evening or a Saturday rather than a sprint. Our guide to planning a meetup program helps if your team wants to host one.
5. Register early. Early registration often costs less and gives first pick of workshops, and our guide to conference passes for less covers other routes.
6. Keep a small reserve for something you can't predict: a workshop announced late, or a team member whose talk is accepted.
7. At the end of the year, ask what each trip changed in the work. Keep the events that produced an experiment and drop the ones that produced a tote bag.

If you are still deciding which kind of event deserves the travel slot, our comparison of festivals, conferences and meetups weighs the formats by the time they take, and the conference value checklist covers making the case to a manager.

Questions

When are the dates for WWDC and Google I/O announced?

Usually a couple of months ahead, in late winter or spring, on Apple's developer site and on Google's I/O site. Neither company publishes dates years in advance, so plan around the usual months and confirm once the announcement is out.

Is it worth flying to WWDC or Google I/O?

For most teams, no. The keynotes, sessions and much of the follow-up material are online and free, and in-person places are limited. The travel budget usually does more at an event where the people in the room are the point.

Why did Android move its major release to the second quarter?

Google said it wanted the major release to line up better with device launches across the Android ecosystem, so that more devices get the new version sooner. The practical effect for developers is that behavior changes arrive earlier in the year.

Do the store deadlines stay the same every year?

The pattern has been steady, but the exact dates and required versions change each year. Apple lists them on its Upcoming Requirements news page and Google on its target API level page in the Android developer documentation. Check both in January and put the dates in the team calendar.