Kesho jioni, tutakusanyika katika jumba la maonyesho kuangalia sanaa.

Yes. Kesho means tomorrow and jioni means evening. Together, kesho jioni means tomorrow evening.

A useful thing to notice is that Swahili often puts time words next to each other like this, without needing an extra word like on or in.

Putting a time expression first is very common in Swahili. It sets the scene right away: when the action will happen.

You could also say:

Tutakusanyika kesho jioni katika jumba la maonyesho kuangalia sanaa.

That is still grammatical. Starting with kesho jioni just sounds very natural and helps foreground the time.

Tutakusanyika can be broken down like this:

• tu- = we
• -ta- = future marker, will
• kusanyika = the verb stem here, gather / assemble

So the whole verb means we will gather / we will assemble.

An important learner point: the ku here is not the object marker you. In this verb, it belongs to the verb stem kusanyika.

The future is shown by -ta-.

So:

• tu-na-kusanyika = we are gathering
• tu-li-kusanyika = we gathered
• tu-ta-kusanyika = we will gather

That -ta- is the key future marker.

Katika means in, inside, within, at and is a perfectly good choice here for a location.

Yes, kwenye would also be possible in many everyday contexts:

...kwenye jumba la maonyesho...

The difference is mostly one of tone and style:

• katika can sound a bit more formal or careful
• kwenye is very common in everyday speech

So both can work, but katika is a nice standard written choice.

Literally, jumba la maonyesho is something like hall/building of exhibitions/displays.

Here is the structure:

• jumba = hall, large building, mansion
• la = of
• maonyesho = exhibitions, displays, shows

The word la is a connector that agrees with the noun jumba. This agreement is based on noun class.

Since jumba is in a noun class that takes la for this kind of of relationship, we say:

jumba la maonyesho

If the first noun belonged to a different class, the connector might change.

Kuangalia is the infinitive to look at / to watch / to view. Here it expresses purpose:

• gather at the exhibition hall
• to look at art

So kuangalia sanaa means to view art or to look at art.

This is a very common Swahili pattern:

[main action] + [place] + ku-verb

For example:

• Tunaenda sokoni kununua matunda. = We’re going to the market to buy fruit.
• Walikaa chini kusubiri. = They sat down to wait.

Because Swahili does not use articles like English a, an, the.

So nouns like jumba and sanaa do not need separate words for that. Whether you understand them as a hall, the hall, art, or the art depends on context.

That is very normal in Swahili, and learners usually get used to it quickly.

In this sentence, sanaa is best understood as art in a general sense.

It often works like a mass noun in English, similar to art rather than an art. Depending on context, it can refer to art in general, artworks, artistic expression, or the arts more broadly.

So here, a natural interpretation is simply art.

A few useful pronunciation points:

• Swahili usually pronounces every vowel clearly
• stress is usually on the second-to-last syllable

A rough guide:

• Kesho = KE-sho
• jioni = ji-O-ni
• tutakusanyika = tu-ta-ku-sa-NYA-ka
• katika = ka-TI-ka
• jumba = JUM-ba
• maonyesho = ma-o-NYE-sho
• kuangalia = ku-an-ga-LI-a
• sanaa = sa-NA-a

Also notice that vowel combinations are usually pronounced separately, not merged the way they often are in English. For example:

• jioni = ji-o-ni
• maonyesho = ma-o-nye-sho
• kuangalia = ku-an-ga-li-a