1. Can you help me paint the hall this weekend?
  2. Can you help me to paint the hall this weekend?

Do we add "to" the second verb (paint) because it's in the infinitive?

  • "Help" is one of a few verbs that can take a bare infinitival complement, but it is optional: Can you help me (to) paint the hall this weekend? – BillJ May 12 '18 at 10:43

Help can be followed by an object and infinitive, with or without "to".
So, both are correct.
The first statement (without "to") is common in an informal style. Ref:'Practical English Usage' by Michael Swan ELBS

  • Answers should be supported by reasonable evidence. Though reasonable checking that the question isn't a duplicate should take place first. – Edwin Ashworth May 12 '18 at 16:29
  • Added reference – SonOfThought May 13 '18 at 2:07
  • Reasonable evidence consists of an attributed quote from a recognised reference work. But you might like to read John Lawler's answer at the duplicate; you'll see that it was heavily upvoted. (Mind you, so were others that I actually downvoted as being too prescriptive.) – Edwin Ashworth May 13 '18 at 14:40

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