El veros a todos

El veros a todos
 

Hi,

El veros a todos aquí me renueva la esperanza.

What el is doing here (if it's not a typo)?

It's not a typo; it's the definite article meaning "the".

In this sentence the subject is "el veros a todos aquí": the head noun is the infinitive "ver", which is accompanied by its direct object, "os a todos", and an adverb, "aquí".

In English we would use the gerund "seeing" as a noun in contexts like your sentence, while Spanish uses the infinitive "ver" as a noun.

English typically does not allow using an article with a gerund in this type of context. However, Spanish frequently allows using an article with an infinitive in this type of context, and sometimes Spanish requires using an article.

As wrholt mentioned, using "el" before a verb infinitive allows you to use it as a noun, similar to how the gerund is used in English.