Get-EventLog and filters out non-interesting EventID's

$System_Ignores =@(
  @{ Source_1 = 1111 },  # You can put a remark here
  @{ Source_2 = 3 },     # And here
  @{ "*" = 4 }           # Asterisk ignores Log source
  # Don't forget: Last element above must not have trailing comma!
  )

$SystemLog = get-eventlog system -after $Date -EntryType Error,Warning

ForEach ($i in $System_Ignores) {
  If ($i.Name -ne "*") {
    $SystemLog = $SystemLog | Where { $_.Source -ne $i.Name -and $_.EventID -ne $i.Value }
    }
  Else {
    $SystemLog = $SystemLog | Where { $_.EventID -ne $i.Value }
    }
  }

$System = ($SystemLog | select Entrytype, Source, EventID, Message, TimeGenerated | format-list)